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首页> 外文期刊>Physical review >Magnetic control of the zero-magnetization ferromagnet Sm_(1-x)Gd_xAl_2
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Magnetic control of the zero-magnetization ferromagnet Sm_(1-x)Gd_xAl_2

机译：零磁化铁磁体Sm_（1-x）Gd_xAl_2的磁控制

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X-ray magnetic circular dichroism experiments have been performed up to ± 17 T to investigate the magnetic configuration and magnetization reversal of an original zero-magnetization ferromagnet Sm_(1-x)Gd_xAl_2 (x = 0.028), both as a single epitaxial layer and as a pinning layer in an exchange-coupled system. The Sm_(0.972)Gd_(0.028)Al_2 single layer appears to exhibit an extraordinary large coercivity that exceeds 20 T below its magnetic compensation (T_(comp)). Despite such huge magnetic stability in the single layer, interface exchange coupling in the bilayer drives the formation of domains in Sm_(0.972)Gd_(0.028)Al_2 and their reversal upon field, both below and at magnetic compensation. Increasing the cooling field yields the increase in exchange-favored domains in Sm_(0.972)Gd_(0.028)Al_2, surprisingly also at T_(comp), whereas, Zeeman energy does not favor this specific orientation neither at compensation nor during the cooling process. We propose a possible scenario for those domains' formation and highlight the way the external magnetic field may tune the magnetic configuration in such a zero-magnetization ferromagnet. The cooling field also consequently influences the SmAl_2 magnetization reversal which is biased by pinned magnetic components in Sm_(0.972)Gd_(0.028)Al_2; the bias field is satisfactorily explained in considering different pinned contributions with opposite magnetic orientations.
机译：已经进行了高达±17 T的X射线磁圆二向色性实验，以研究原始零磁化铁磁体Sm_（1-x）Gd_xAl_2（x = 0.028）的磁结构和磁化反转，二者均为单个外延层，作为交换耦合系统中的固定层。 Sm_（0.972）Gd_（0.028）Al_2单层似乎表现出非常大的矫顽力，比其磁补偿（T_（comp））低20 T以上。尽管在单层中具有如此大的磁稳定性，但双层中的界面交换耦合仍驱动Sm_（0.972）Gd_（0.028）Al_2中的畴的形成以及它们在磁场以下和磁场补偿时的反转。增大冷却场会导致Sm_（0.972）Gd_（0.028）Al_2中交换有利的畴的增加，也令人惊讶地在T_（comp）处，而塞曼能量无论在补偿时还是在冷却过程中均不赞成这种特定的取向。我们为这些磁畴的形成提出了一种可能的方案，并强调了外部磁场如何调整这种零磁化铁磁体中的磁性结构。因此，冷却场也影响SmAl_2的磁化反转，该反转由Sm_（0.972）Gd_（0.028）Al_2中固定的磁性成分偏置；在考虑具有相反磁性方向的不同固定贡献时，可以令人满意地说明偏置场。

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