论文标题
在具有垂直各向异性的铁磁多层磁化的重新定位时磁化效应
Magnetocaloric effect at the reorientation of the magnetization in ferromagnetic multilayers with perpendicular anisotropy
论文作者
论文摘要
我们研究了通过施加到由两种不同的铁磁（FM）材料组成的交换耦合多层系统的磁场旋转获得的磁电效应。我们特别考虑了一个系统，其中两个FM具有垂直单轴各向异性轴并利用条件，当两层各向异性之间的补偿时，这会产生总磁化的重新定位。我们计算与“人造”重新定向相关的随之而来的熵变化。通过使用MNBI和CO的已知参数，我们可以预测$δs= 0.34 $ jkg $^{ - 1} $ k $^{ - 1} $的熵更改用于完美耦合。最后，我们通过微磁模型研究了在旋转磁场下多层的行为。当层厚度处于局部域壁宽度的级数时，磁场诱导的熵变化可以用磁场比未偶联的情况低一个数量级。
We investigate the magnetocaloric effect obtained by the rotation of a magnetic field applied to an exchange-coupled multilayer system composed of two different ferromagnetic (FM) materials. We specifically consider a system in which the two FMs have perpendicular uniaxial anisotropy axes and utilise conditions which yield a reorientation of the total magnetization when compensation between the anisotropies of the two layers occurs. We calculate the consequent entropy change associated with the "artificial" reorientation. By using known parameters from MnBi and Co we predict an entropy change of $Δs = 0.34$ Jkg$^{-1}$K$^{-1}$ for perfect coupling. Lastly, we study the behavior of the multilayer under a rotating magnetic field via a micromagnetic model. When the layer thicknesses are of the order of the local domain wall width, the magnetic field-induced entropy change can be obtained with magnetic fields one order of magnitude lower than in the uncoupled case.
