X-ray magnetic linear dichroism as a probe for non-collinear magnetic state in ferrimagnetic single layer exchange bias systems.,Scientific Reports

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X-ray magnetic linear dichroism as a probe for non-collinear magnetic state in ferrimagnetic single layer exchange bias systems.
Scientific Reports ( IF 3.8 ) Pub Date : 2019-12-03 , DOI: 10.1038/s41598-019-54356-y
Chen Luo _{1,

2,

3} , Hanjo Ryll ₁ , Christian H Back _{2,

3} , Florin Radu ₁

Affiliation

Ferrimagnetic alloys are extensively studied for their unique magnetic properties leading to possible applications in perpendicular magnetic recording, due to their deterministic ultrafast switching and heat assisted magnetic recording capabilities. On a prototype ferrimagnetic alloy we demonstrate fascinating properties that occur close to a critical temperature where the magnetization is vanishing, just as in an antiferromagnet. From the X-ray magnetic circular dichroism measurements, an anomalous 'wing shape' hysteresis loop is observed slightly above the compensation temperature. This bears the characteristics of an intrinsic exchange bias effect, referred to as atomic exchange bias. We further exploit the X-ray magnetic linear dichroism (XMLD) contrast for probing non-collinear states which allows us to discriminate between two main reversal mechanisms, namely perpendicular domain wall formation versus spin-flop transition. Ultimately, we analyze the elemental magnetic moments for the surface and the bulk parts, separately, which allows to identify in the phase diagram the temperature window where this effect takes place. Moreover, we suggests that this effect is a general phenomenon in ferrimagnetic thin films which may also contribute to the understanding of the mechanism behind the all optical switching effect.

中文翻译：

X射线磁性线性二向色性作为亚铁磁性单层交换偏置系统中非共线磁性状态的探针。

由于亚铁磁性合金具有确定性的超快切换和热辅助磁记录功能，因此对其独特的磁性能进行了广泛的研究，从而使其可能在垂直磁记录中得到应用。在原型亚铁磁性合金上，我们证明了在反铁磁体中接近磁化强度消失的临界温度时出现的令人着迷的特性。通过X射线磁性圆二色性测量，观察到略高于补偿温度的异常“翼形”磁滞回线。这具有固有的交换偏向效应的特征，称为原子交换偏向。我们进一步利用X射线磁性线性二向色性（XMLD）对比来探测非共线状态，这使我们能够区分两种主要的反转机制，即垂直畴壁形成与自旋跃迁转变。最终，我们分别分析了表面和散装零件的元素磁矩，从而可以在相图中确定发生这种效应的温度窗口。此外，我们认为这种效应是铁磁薄膜中的普遍现象，也可能有助于理解所有光学开关效应的机理。这样可以在相图中确定发生这种影响的温度窗口。此外，我们认为这种效应是铁磁薄膜中的普遍现象，也可能有助于理解所有光学开关效应的机理。这样可以在相图中确定发生这种影响的温度窗口。此外，我们认为这种效应是铁磁薄膜中的普遍现象，这也可能有助于理解所有光学开关效应背后的机理。

更新日期：2019-12-03

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