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首页> 外文期刊>IEEE Transactions on Magnetics >Domain Wall Switching: Optimizing the Energy Landscape
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Domain Wall Switching: Optimizing the Energy Landscape

机译：域墙切换：优化能源格局

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It has recently been suggested that exchange spring media offer a way to increase media density without causing thermal instability (superparamagnetism), by using a hard and a soft layer coupled by exchange. Victora has suggested a figure of merit xi=2Eb/mu0msHsw, the ratio of the energy barrier to that of a Stoner-Wohlfarth system with the same switching field, which is 1 for a Stoner-Wohlfarth (coherently switching) particle and 2 for an optimal two-layer composite medium. A number of theoretical approaches have been used for this problem (e.g., various numbers of coupled Stoner-Wohlfarth layers and continuum micromagnetics). In this paper we show that many of these approaches can be regarded as special cases or approximations to a variational formulation of the problem, in which the energy is minimized for fixed magnetization. The results can be easily visualized in terms of a plot of the energy E as a function of magnetic moment mz, in which both the switching field [the maximum slope of E(mz)] and the stability (determined by the energy barrier DeltaE) are geometrically visible. In this formulation we can prove a rigorous limit on the figure of merit xi, which can be no higher than 4. We also show that a quadratic anistropy suggested by Suess comes very close to this limit.
机译：最近已经提出，通过使用通过交换耦合的硬层和软层，交换弹簧介质提供了一种在不引起热不稳定性（超顺磁性）的情况下增加介质密度的方法。 Victora提出了一个品质因数xi = 2Eb / mu0msHsw，即具有相同转换场的斯托纳-沃尔法斯系统的能垒比，对于斯托纳-沃尔法斯（相干转换）粒子为1，对于一个相干粒子为2。最佳的两层复合介质。已经针对该问题使用了许多理论方法（例如，各种数量的耦合的斯托纳-沃尔法斯层和连续体微磁性）。在本文中，我们表明，这些方法中的许多方法都可以看作是问题变分形式的特殊情况或近似形式，其中对于固定磁化，能量被最小化。根据能量E与磁矩mz的关系图，可以很容易地看到结果，其中开关场[E（mz）的最大斜率]和稳定性（由能垒DeltaE决定）在几何上是可见的。在此公式中，我们可以证明对品质因数xi的严格限制，该限制不得高于4。我们还表明Suess建议的二次人类学非常接近此限制。

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