List of Russian scientists: Difference between revisions

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The '''Stoner–Wohlfarth model''' is a widely used model for the [[magnetization]] of [[single-domain (magnetic)|single-domain]] [[ferromagnets]].<ref name=sw>{{Harvnb|Stoner|Wohlfarth|1948}}</ref> It is a simple example of [[Hysteresis#Magnetic hysteresis|magnetic hysteresis]] and is useful for modeling small magnetic particles in [[magnetic storage]], [[biomagnetism]], [[rock magnetism]] and [[paleomagnetism]].
This licensed U.S. Marines combat knife is created with pride by Mtech USA. This attempted and accurate knife characteristics a partially serrated 440 stainless steel blade with the USMC logo. The stacked leather manage with 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metal spacers] gives this knife a secure grip, and the solid steel pommel can be employed for many applications as a tool and in combat. The Marine combat knife also comes with a major grain leather sheath with stamped Marines logo.<br><br>Not only is this a higher good quality knife, the sheath is also prime high-quality. The kydex sheath holds the Ka-bar 1245 securely, and has lots of holes so that you can attach it to a range of factors. The 1 point that is annoying about the sheath is that is can be a bit noisy when placing the knife in, or taking the knife out. This is basically due to the locking mechanism constructed into the sheath. The Ka-bar 1245 has a serrated section close to the manage around two inches lengthy. If you don't like a serrated blade, you can get a Ka-bar that doesn't have the serrated edge, but that knife is only nine inches lengthy instead of 12 inches extended. My only complaint is that the micarta handle could be a bit broader and deeper giving for a far more full hand.<br><br>This stylish switchblade by Spyderco appears excellent and feels even far better. Spyderco bills it as the ambassador of their automatic knife lineup, and for fantastic purpose. As a really economical option, the Embassy Auto has a nicely completed aluminum deal with with a wicked Wharncliffe shaped blade in CPM S30V steel. The release button is recessed in the deal with so that the blade will not accidentally be deployed, when set down on a really hard surface for example, and capabilities a secondary lock button as a additional safety measure. Although this automatic knife is set up mostly for appropriate handers, the three position pocket clip can be conveniently swapped for tip up or tip down carry for either right or left handers.<br><br>A very good manage is critical for a knife simply because immediately after all you are holding the knife there. In a survival or self-defense circumstance you don't want it to break when you apply too a great deal force. It should really feel comfy when you use it and deal with it below stress. There need to be no pinch points, [http://Sss.chaoslab.ru/tracker/mim_plugs/newticket?reporter=anonymous&summary=AttributeError%3A+%27Environment%27+object+has+no+attribute+%27get_db_cnx%27&description=Below+I%27ve+laid+out+my+aspirational+EDC.+When+checking+out+my+list%2C+keep+in+thoughts+you+will+see+double.+One+particular+of+the+tenets+I+subscribe+to+is+the+Navy+SEAL+adage+%E2%80%9CTwo+is+1%2C+and+one+particular+is+none.%E2%80%9D+Redundancies+people%2C+redundancies.++If+you+loved+this+short+article+and+also+you+would+want+to+obtain+details+regarding+%5Bhttp%3A%2F%2Fwww.thebestpocketknifereviews.com%2Fbest-edc-knife-everyday-carry-knives%2F+http%3A%2F%2Fwww.thebestpocketknifereviews.com%5D+kindly+go+to+our+own+page.+Things+generally+fail+at+the+worst+achievable+time%2C+possessing+a+back+up+can+literally+be+a+life+saver.+Also%2C+keep+in+mind+that+although+this+is+my+dream+EDC+kit%2C+carrying+all+of+it+each+and+every+day+isn%27t+usually+realistic%2C+but+rotating+things+keeps+my+fundamentals+much+more+than+covered.+Triple+Aught+Design+BRATT%0D%0A%0D%0A%5B%5Biframe+%2F%2Fwww.youtube.com%2Fembed%2FovB4gNzV9wg+height%3D%22360%22+width%3D%22640%22%5D%5DConsidering+that+I+personally+favor+my+knives+to+be+subtle+when+they+go+into+my+pocket%2C+this+has+got+to+be+a+single+of+my+least+favourite+clips+in+my+collection.+That+shiny+stainless+steel+building+may+perhaps+appear+quite+good+to+some%2C+but+1+factor+it+does+not+do+is+hide+the+reality+that+you+have+got+a+knife+on+you.+It+virtually+demands+to+be+seen.+Bare+that+in+mind+when+acquiring+%E2%80%93+in+particular+if+you+reside+in+a+country+that+is+not+very+tolerant+when+it+comes+to+carrying+cutting+tools.+If+you+want+to+use+the+pocket+clip%2C+you+happen+to+be+not+going+to+be+capable+to+hide+this+a+single.%0D%0A%0D%0AA+knife+must+satisfy+the+minimum+criteria+to+be+referred+to+as+as+%E2%80%9CBest+Every+day+Carry+Knife%E2%80%9D.+You+should+appear+for+some+simple+qualities+when+obtaining+a+very+best+edc+knife+to+make+sure+it%27s+not+a+low-cost+imitation.+Definitely%2C+you+never+want+to+obtain+a+kitchen+knife+and+use+it+for+carrying+about+and+performing+day-to-day+tasks.+The+ideal+each+day+carry+knife+really+should+be+made+of+powerful+high+quality+stainless+steel+and+tough.+Ifare+looking+EDC+Knives%2C+take+a+look+at+%2C+and+find+the+Most+effective+EDC+knives+on+on+line.+We+deliver+full+detail+about+of+Knives+with+images.+If+you+have+the+funds+-+The+%5Bhttp%3A%2F%2Fwww.fort-awesome.net%2Fnewticket%3Freporter%3Danonymous%26summary%3DIntegrityError%253A%2Bspamfilter_log.id%2Bmay%2Bnot%2Bbe%2BNULL%26description%3D%250D%250A%250D%250ADo%2Bpeople%2Bnonetheless%2Bcarry%2Ba%2Btactical%2Bknife%2B%253F%2BIs%2Bit%2Bsecure%2Bto%2Bcarry%2Ba%2Btactical%2Bknife%253F%2BConcerns%2Blike%2Bthese%2Bwill%2Bhave%2Bto%2Bhave%2Bpopped%2Bin%2Byour%2Bhead%2Bjust%2Bafter%2Breading%2Bthe%2Btitle.%2BThe%2Breality%2Bis%252C%2Beven%2Btoday%2Bfolks%2Bare%2Bfond%2Bof%2Bcarrying%2Btactical%2Bknives%2Bas%2Bthey%2Bdo%2Bnot%2Bjust%2Bsupply%2Bprotection%252C%2Bbut%2Balso%2Bcan%2Bbe%2Butilised%2Bin%2Bmany%2Bstrategies.%250D%250A%250D%250AYou%2Bcan%2Buse%2Byour%2Bselected%2Btactical%2Bknife%2Bto%2Bcut%2Bby%2Bway%2Bof%2Bpractically%2Bsomething%2Band%2Bif%2Byou%2Bbuy%2Bthe%2Bcorrect%2Bknife%252C%2Byou%2Bcan%2Balso%2Buse%2Bit%2Bto%2Bget%2Bstarted%2Ba%2Bcampfire%2Bif%2Byou%2Bcome%2Bacross%2Boneself%2Bin%2Ba%2Bbind.%2BEven%2Bso%252C%2Bdue%2Bto%2Bthe%2Bquantity%2Bof%2B%255Bhttp%253A%252F%252Fanswers.Yahoo.com%252Fsearch%252Fsearch_result%253Fp%253Dreports%2526submit-go%253DSearch%252BY%2521%252BAnswers%2Breports%255D%2Bthat%2Bthe%2Bblade%2Bis%2Bin%2Bsome%2Bcases%2Brather%2Bflimsy%252C%2Bit%2Bcould%2Bnot%2Bbe%2Bthe%2Bmost%2Beffective%2Bdecision%2Bfor%2Beveryone%2Bwho%2Bis%2Bhunting%2Bfor%2Ba%2Btactical%2Bknife%2Bthat%2Bwill%2Bsee%2Ba%2Bhigher%2Blevel%2Bof%2Buse.%2BPocket%2Bknives%252C%2Bwhich%2Bincludes%2Ba%2Bfolding%2Bknife%2Bor%2Bany%2Bof%2Bthe%2Bsurvival%2Bknives%2Breviewed%252C%2Bhave%2Bjust%2Btwo%2Bmain%2Bcomponents%2B%25E2%2580%2593%2Bthe%2Bblade%2Band%2Bthe%2Bgrip%2B%25E2%2580%2593%2Band%2Bit%2Breally%2Bis%2Bgenuinely%2Bcrucial%2Bto%2Bselect%2Bthese%2Bcarefully.%2BAppear%2Bfor%2Ba%2Bblade%2Bproduced%2Bfrom%2Bthe%2Bgreatest%2Bexcellent%2Bsteel%2Byou%2Bcan%2Bafford%2B%2528see%2Bmy%2Bguides%2Bon%2Bthe%2Bvariations%2Bin%2Bbetween%2Bstainless%2Bsteel%252C%2B154CM%252C%2BATS34%252C%2Band%2B440C%2Bsteel%2529.%2BHissatsu%2Btwo%2Bis%2Ba%2BCovert%2BTactical%2BWinner%250D%250A%250D%250AA%2Bfixed%2Bblade%2Bknife%2Bmay%2Bwell%2Bbe%2Blarger%2Bin%2Bsize%2Bbut%2Bmay%2Bfinal%2Blonger%2Bthan%2Ba%2Bfolding%2Bknife.%2BSo%252C%2Bdepending%2Bon%2Byour%2Bneed%2Band%2Bintention%2Bof%2Buse%252C%2Byou%2Bneed%2Bto%2Bchoose%2Bthe%2Bproper%2Bsize%2Bof%2Bthe%2Bvery%2Bbest%2Btactical%2Bknife%2Bto%2Bmatch%2Byour%2Bobjective.%2B%2BIf%2Byou%2Badored%2Bthis%2Barticle%2Band%2Balso%2Byou%2Bwould%2Blike%2Bto%2Bget%2Bmore%2Binfo%2Bpertaining%2Bto%2B%255Bhttp%253A%252F%252Fwww.thebestpocketknifereviews.com%252Fbest-edc-knife-everyday-carry-knives%252F%2Bbest%2Bedc%2BKnife%255D%2Bkindl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sharp corners] or unnatural feel to the handle. 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== History ==
The Stoner–Wohlfarth model was developed by [[Edmund Clifton Stoner]] and [[Erich Peter Wohlfarth]] and published in 1948.<ref name=sw/> It included a numerical calculation of the integrated response of randomly oriented magnets. Since this was done before computers were widely available, they resorted to trigonometric tables and hand calculations.
 
==Description==
[[File:StonerWohlfarthModel Illustration.svg|thumb|300px|upright|Figure 1. Illustration of the variables used in the Stoner–Wolhfarth model. The dashed line is the [[easy axis]] of the particle.]]
In the Stoner−Wohlfarth model, the magnetization does not vary within the ferromagnet and it is represented by a vector {{math|'''''M'''''}}. This vector rotates as the magnetic field {{math|'''''H'''''}} changes. The magnetic field is only varied along a single axis; its scalar value {{math|''h''}} is positive in one direction and negative in the opposite direction. The ferromagnet is assumed to have a uniaxial [[magnetic anisotropy]] with anisotropy parameter {{math|''K''<sub>u</sub>}}. As the magnetic field varies, the magnetization is restricted to the plane containing the magnetic field direction and the [[easy axis]]. It can therefore be represented by a single angle {{math|''&phi;''}}, the angle between the magnetization and the field (Figure 1). Also specified is the angle {{math|''&theta;''}} between the field and the easy axis.
 
=== Equations ===
The energy of the system is<br />
{{NumBlk|:|<math>E = K_uV\sin^2\left(\phi-\theta\right) - \mu_0M_sVH\cos\phi, \,</math>|{{EquationRef|1}}}}
where {{math|''V''}} is the volume of the magnet, {{math|''M''<sub>s</sub>}} is the [[saturation magnetization]], and {{math|''&mu;''<sub>0</sub>}} is the [[vacuum permeability]]. The first term is the [[magnetic anisotropy]] and the second the energy of coupling with the applied field (often called the Zeeman energy).
 
Stoner and Wohlfarth normalized this equation:<br />
{{NumBlk|:|<math>\eta = \frac{E}{2K_uV} = \frac{1}{4} -\frac{1}{4}\cos\left(2\left(\phi-\theta\right)\right) - h\cos\phi, \,</math>|{{EquationRef|2}}}}
where {{math|''h'' {{=}} &mu;<sub>0</sub>''M''<sub>s</sub>''H''/2''K''<sub>u</sub>}}.
A given magnetization direction is in [[mechanical equilibrium]] if the forces on it are zero. This occurs when the first derivative of the energy with respect to the magnetization direction is zero:<br />
{{NumBlk|:|<math>\frac{\partial\eta}{\partial \phi} = \frac{1}{2}\sin\left(2\left(\phi-\theta\right)\right) + h\sin\phi = 0. \,</math>|{{EquationRef|3}}}}
This direction is stable against perturbations when it is at an energy minimum, having a positive second derivative:<br />
{{NumBlk|:|<math>\frac{\partial^2\eta}{\partial \phi^2} = \cos\left(2\left(\phi-\theta\right)\right) + h\cos\phi > 0. \,</math>|{{EquationRef|4}}}}
In zero field the magnetic anisotropy term is minimized when the magnetization is aligned with the easy axis. In a large field, the magnetization is pointed towards the field.<ref name=sw/>
 
=== Hysteresis loops ===
[[File:SwHystExample.svg|thumb|300px|upright|Figure 2. An example solution of the Stoner–Wolhfarth model. Both {{math|''h''}} and {{math|''m''<sub>h</sub>}} are between {{math|−1}} and {{math|+1}}. The solid red and blue curves are energy minima, the dashed red and blue lines are energy maxima. Energy profiles are included for three vertical profiles (insets).]]
For each angle {{math|''&theta;''}} between easy axis and field, equation ({{EquationNote|3}}) has a solution that consists of two solution curves. It is trivial to solve for these curves by varying {{math|''&phi;''}} and solving for {{math|''h''}}. There is one curve for {{math|''&phi;''}} between {{math|0}} and {{math|''&pi;''}} and another for {{math|''&phi;''}} between {{math|''&pi;''}} and {{math|2''&pi;''}}; the solutions at {{math|''&phi;'' {{=}} 0}} and {{math|''&pi;''}} correspond to {{math|''h'' {{=}} &plusmn;&infin;}}.<ref name=sw/>
 
Since the magnetization in the direction of the field is {{math|''M''<sub>s</sub> cos ''&phi;''}}, these curves are usually plotted in the normalized form {{math|''m''<sub>h</sub>}} vs. {{math|''h''}}, where {{math|''m''<sub>h</sub> {{=}} cos ''&phi;''}} is the component of magnetization in the direction of the field. An example is shown in Figure 2. The solid red and blue curves connect stable magnetization directions. For fields {{math|−1/2 &le; h &le; 1/2}}, the two curves overlap and there are two stable directions. This is the region where [[hysteresis]] occurs. Three energy profiles are included (insets). The red and blue stars are the stable magnetization directions, corresponding to energy minima. Where the vertical dashed lines intersect the red and blue dashed lines, the magnetization directions are energy maxima and determine the [[energy barrier]]s between states.<ref name=sw/>
 
In an ordinary magnetic hysteresis measurement, {{math|''h''}} starts at a large positive value and is decreased to a large negative value. The magnetization direction starts on the blue curve. At {{math|''h'' {{=}} 0.5}} the red curve appears, but for {{math|''h'' > 0}} the blue state has a lower energy because it is closer to the direction of the magnetic field. When the field becomes negative, the red state has the lower energy, but the magnetization cannot immediately jump to this new direction because there is an energy barrier in between (see the insets). At {{math|''h'' {{=}} −0.5}}, however, the energy barrier disappears, and in more negative fields the blue state no longer exists. It must therefore jump to the red state. After this jump, the magnetization remains on the red curve until the field increases past {{math|''h'' {{=}} 0.5}}, where it jumps to the blue curve. Usually only the hysteresis loop is plotted; the energy maxima are only of interest if the effect of [[thermal fluctuations]] is calculated.<ref name=sw/>
 
The Stoner–Wohlfarth model is a classic example of magnetic hysteresis. The loop is symmetric (by a {{math|180<sup>&deg;</sup>}} rotation) about the origin and jumps occur at {{math|''h'' {{=}} &plusmn; ''h''<sub>s</sub>}}, where {{math|''h''<sub>s</sub>}} is known as the ''switching field''. All the hysteresis occurs at {{math|&plusmn; ''h''<sub>s</sub>}}.
 
=== Dependence on field direction ===
[[File:SwHyst vs angle.svg|thumb|300px|left|Figure 3. Some hysteresis loops predicted by the Stoner–Wolhfarth model for different angles between the field and easy axis.]]
 
The shape of the hysteresis loop has a strong dependence on the angle between the magnetic field and the easy axis (Figure 3). If the two are parallel ({{math|''&theta;'' {{=}} 0}}), the hysteresis loop is at its biggest (with {{math|''m''<sub>h</sub> {{=}} ''h''<sub>s</sub> {{=}} 1}} in normalized units). The magnetization starts parallel to the field and does not rotate until it becomes unstable and jumps to the opposite direction. In general, the larger the angle, the more reversible rotation occurs. At the other extreme of {{math|''&theta;'' {{=}} 90<sup>&deg;</sup>}}, with the field perpendicular to the easy axis, no jump occurs. The magnetization rotates continuously from one direction to the other (it has two choices of rotation direction, though).
 
For a given angle {{math|''&theta;''}}, the switching field is the point where the solution switches from an energy minimum {{math|(&part;<sup>2</sup>''&eta;''/&part; ''&phi;''<sup>2</sup> > 0)}} to an energy maximum {{math|(&part;<sup>2</sup>''&eta;''/&part; ''&phi;''<sup>2</sup> < 0)}}. Thus, it can be calculated directly by solving equation ({{EquationNote|3}}) along with {{math|&part;<sup>2</sup>''&eta;''/&part; ''&phi;''<sup>2</sup> {{=}} 0}}. The solution is<br />
{{NumBlk|:|<math>h_s = \frac{\left(1-t^2+t^4\right)^{1/2}}{1+t^2}, \,</math>|{{EquationRef|5}}}}
where<br />
{{NumBlk|:|<math>t=\tan^{1/3}\theta. \,</math>|{{EquationRef|6}}}}
In normalized units, {{math|0.5 &le; ''h''<sub>s</sub> &le; 1}}.<ref name=sw/>
 
An alternative way of representing the switching field solution is to divide the vector field {{math|'''''h'''''}} into a component {{math|''h''<sub>{{!}}{{!}}</sub> {{=}} ''h'' cos ''&theta;''}} that is parallel to the easy axis, and a component {{math|''h''<sub>&perp;</sub> {{=}} h sin ''&theta;''}} that is perpendicular. Then<br />
{{NumBlk|:|<math>h_\parallel^{2/3}+h_\perp^{2/3}=1. \,</math>|{{EquationRef|7}}}}
If the components are plotted against each other, the result is a [[Stoner–Wohlfarth astroid]]. A magnetic hysteresis loop can be calculated by applying a geometric construction to this astroid.<ref>{{Harvnb|Mayergoyz|2003}}</ref>
 
== Predictions for homogeneous, isotropic systems ==
 
=== Hysteresis ===
[[File:StonerWohlfarthMainLoop.svg|thumb|300px|right|Figure 4. Main hysteresis loop for an isotropic sample with identical particles. The magnetization and field are normalized ({{math|''m''<sub>h</sub> {{=}} ''M''<sub>H</sub>/''M''<sub>s</sub>}}, {{math|''h'' {{=}} ''H''/2''K''<sub>u</sub>}}). The curve starting at the origin is the [[initial magnetization curve]]. Double arrows represent reversible change, a single arrow irreversible change.]]
Stoner and Wohlfarth calculated the main hysteresis loop for an [[isotropic]] system of randomly oriented, identical particles. The result of the calculation is reproduced in Figure 4. Irreversible change (single arrow) occurs for {{math|0.5 &lt; {{!}}''h''{{!}} &lt; 1}}, reversible change (double arrows) elsewhere. The normalized [[remanence#Saturation remanence|saturation remanence]] {{math|''m''<sub>rs</sub>}} and [[coercivity]] {{math|''h''<sub>c</sub>}} are indicated on the figure. The curve in the center is the [[initial magnetization curve]]. This simulates the behavior of the sample if it is demagnetized before applying a field. The demagnetization is assumed to leave each particle with an equal probability of being magnetized in either of the two directions parallel to the easy axis. Thus, it is an average of the upper and lower branches of the main loop.<ref name=sw/>
 
=== Isothermal remanence ===
[[File:StonerWohlfarthIRM.svg|thumb|300px|left|Figure 5. Three kinds of isothermal remanence for an [[isotropic]] system of randomly oriented, identical particles. The remanences are {{math|''m''<sub>ir</sub>}}, isothermal remanent magnetization; {{math|''m''<sub>af</sub>}}, alternating field demagnetization remanence; and {{math|''m''<sub>df</sub>}}, dc demagnetization remanence. ]]
Some remanence calculations for randomly oriented, identical particles are shown in Figure 5. [[remanence#Isothermal remanence|Isothermal remanent magnetization]] (IRM) is acquired after demagnetizing the sample and then applying a field. The curve {{math|''m''<sub>ir</sub>(''h'')}} shows the normalized remanence as a function of the field. No change occurs until {{math|''h'' {{=}} 0.5}} because all the switching fields are larger than {{math|0.5}}. Up to this field, changes in magnetization are reversible. The magnetization reaches saturation at {{math|''h'' {{=}} 1}}, the largest switching field.
 
The other two types of remanence involve demagnetizing a [[remanence#Saturation remanence|saturation isothermal remanence]] (SIRM), so in normalized units they start at {{math|1}}. Again, nothing happens to the remanence until the field reaches {{math|0.5}}. The field at which {{math|''m''<sub>dc</sub>}} reaches zero is called the [[coercivity of remanence]].
 
{| class="wikitable" style="float: right;"
|+ Hysteresis parameters predicted for identical, randomly oriented particles
|-
! Parameter !! Prediction
|-
| <math>M_{rs}/M_s</math> || <math>0.5</math>
|-
| <math>H_c/2K_u</math> || <math>0.479</math>
|-
| <math>H_{cr}/2K_u</math> || <math>0.524</math>
|-
| <math>\chi_0/2K_u</math> || <math>2/3</math>
|-
| <math>H_{cr}/H_c</math> || <math>1.09</math>
|}
Some magnetic hysteresis parameters predicted by this calculation are shown in the table to the right. The normalized quantities used in the above equations have been expressed in terms of the normal measured quantities. The parameter {{math|''H''<sub>cr</sub>}} is the [[coercivity of remanence]] and {{math|''&chi;''<sub>0</sub>}} is the [[initial susceptibility]] (the [[magnetic susceptibility]] of a demagnetized sample).<ref name=sw/>
 
== More general systems ==
 
The above calculations are for identical particles. In a real sample the magnetic anisotropy parameter {{math|''K''<sub>u</sub>}} will be different for each particle. This does not change the ratio {{math|''M''<sub>rs</sub>/''M''<sub>s</sub>}}, but it does change the overall shape of the loop.<ref name=Wohlfarth>{{Harvnb|Wohlfarth|1958}}</ref> A parameter that is often used to characterize the shape of the loop is the ratio {{math|''H''<sub>cr</sub>/''H''<sub>c</sub>}}, which is 1.09 for a sample with identical particles and larger if they are not identical. Plots of {{math|''M''<sub>rs</sub>/''M''<sub>s</sub>}} against {{math|''H''<sub>cr</sub>/''H''<sub>c</sub>}} are widely used in [[rock magnetism]] as a measure of the domain state ([[single-domain (magnetic)|single-domain]] or [[multidomain]]) in magnetic minerals.<ref>{{Harvnb|Day|Fuller|Schmidt|1977}}</ref>
 
=== Wohlfarth relations ===
 
Wohlfarth identified relations between the remanences that hold true for any system of Stoner–Wohlfarth particles:<br />
{{NumBlk|:|<math>\begin{align}
                M_{af}(H) &= M_{rs} - M_{ir}(H) \\
                M_{df}(H) &= M_{rs} - 2M_{ir}(H)
                \end{align}. \,</math>|{{EquationRef|8}}}}
These ''Wohlfarth relations'' compare IRM with demagnetization of saturation remanence. Wohlfarth also described more general relations comparing the acquiring a non-saturation IRM and demagnetizing it.<ref name="Wohlfarth" />
 
The Wohlfarth relations can be represented by linear plots of one remanence against another. These ''Henkel plots'' are often used to display measured remanence curves of real samples and determine whether Stoner–Wohlfarth theory applies to them.<ref>{{Harvnb|Zhang et al.|2003}}</ref>
 
== Extensions of the model ==
The Stoner–Wohlfarth model is useful in part because it is so simple, but it often falls short of representing the actual magnetic properties of a magnet. There are several ways in which it has been extended:
* ''Generalizing the [[magnetic anisotropy]]:'' Hysteresis loops have been calculated for particles with pure cubic [[magnetocrystalline anisotropy]] as well as mixtures of cubic and uniaxial anisotropy.
* ''Adding [[thermal fluctuations]]:'' Thermal fluctuations make jumps between stable states possible, reducing the hysteresis in the system. Pfeiffer<ref>{{Harvnb|Pfeiffer|1990}}</ref> added the effect of thermal fluctuations to the Stoner–Wohlfarth model. This makes the hysteresis dependent on the size of the magnetic particle. As the particle size (and the [[Néel relaxation theory|time between jumps]]) decreases, it eventually crosses over into [[superparamagnetism]].
* ''Adding particle interactions:'' Magnetostatic or exchange coupling between magnets can have a large effect on the magnetic properties. If the magnets are in a chain, they may act in unison, behaving much like Stoner–Wohlfarth particles. This effect is seen in the [[magnetosomes]] of [[magnetotactic bacteria]]. In other arrangements, the interactions may reduce the hysteresis.
* ''Generalizing to non-uniform magnetization:'' This is the domain of [[micromagnetics]].
 
== Notes ==
{{Reflist|2}}
 
== References ==
{{Refbegin}}
*{{cite journal
|doi = 10.1016/0031-9201(77)90108-X
|last1 = Day
|first = R.
|last2 = Fuller
|first2 = M.
|last3 = Schmidt
|first3 = V. A.
|title = Hysteresis properties of titanomagnetites: grain-size and compositional dependence
|journal = [[Physics of the Earth and Planetary Interiors]]
|volume = 13
|issue = 4
|pages = 260–267
|year = 1977
|bibcode = 1977PEPI...13..260D
|ref=harv
}}
*{{cite book
|first = Isaak D.
|last = Mayergoyz
|title = Mathematical Models of Hysteresis and their Applications
|edition = Second
|publisher = [[Academic Press]]
|year = 2003
|isbn = 978-0124808737
|ref=harv
}}
*{{cite journal
|doi = 10.1002/pssa.2211180133
|last = Pfeiffer
|first = H.
|title = Determination of anisotropy field distribution in particle assemblies taking into account thermal fluctuations
|journal = [[Physica Status Solidi A]]
|volume = 118
|issue = 1
|pages = 295–306
|year = 1990
|bibcode = 1990PSSAR.118..295P
|ref=harv
}}
*{{cite journal
  |last1 = Stoner
  |first1 = E. C.
  |authorlink1 = Edmund Clifton Stoner
  |last2 = Wohlfarth
  |first2 = E. P.
  |authorlink2 = Erich Peter Wohlfarth
  |title = A mechanism of magnetic hysteresis in heterogeneous alloys
  |journal = [[Philosophical Transactions of the Royal Society A: Physical, Mathematical and Engineering Sciences]]
  |volume = 240
  |issue = 826
  |pages = 599–642
  |year = 1948
  |doi = 10.1098/rsta.1948.0007
|bibcode = 1948RSPTA.240..599S
|ref=harv
}}
*{{cite journal
|doi = 10.1063/1.1723232
|last = Wohlfarth
|first = E. P.
|authorlink = Erich Peter Wohlfarth
|title = Relations between different modes of acquisition of the remanent magnetization of ferromagnetic particles
|journal = [[Journal of Applied Physics]]
|volume = 29
|issue = 3
|pages = 595–596
|year = 1958
|bibcode = 1958JAP....29..595W
|ref=harv
}}
*{{cite journal
|last1 = Zhang
|first = H.
|last2 = Rong
|first2 = C.
|last3 = Zhang
|first3 = J.
|last4 = Zhang
|first4 = S.
|last5 = Zhang
|first5 = Shao-Ying
|last6 = Shen
|first6 = Bao-gen
|title = Investigation on intergrain exchange coupling of nanocrystalline permanent magnets by Henkel plot
|journal = [[Applied Physics Letters]]
|volume = 82
|issue = 23
|pages = 4098–4100
|year = 2003
|doi = 10.1063/1.1576291
|bibcode = 2003ApPhL..82.4098Z
|ref={{harvid|Zhang et al.|2003}}
}}
{{Refend}}
 
{{DEFAULTSORT:Stoner-Wohlfarth model}}
[[Category:Magnetic ordering]]
[[Category:Rock magnetism]]

Revision as of 13:58, 4 February 2014

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