Interfacial exchange coupling between transition metals and Mn1.5Ga studied by X-ray magnetic circular dichroism
Interfacial exchange coupling between transition metals and Mn1.5Ga studied by X-ray magnetic circular dichroism
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DOI：
10.1016/j.jmmm.2018.03.060
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发表时间：
2016-07
影响因子：
2.7
通讯作者：
J. Okabayashi;Kazuya Z. Suzuki;S. Mizukami
中科院分区：
文献类型：
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作者：
J. Okabayashi;Kazuya Z. Suzuki;S. Mizukami
利用X射线磁性圆二色性（XMCD）研究了Fe（1 nm）/Mn1.5Ga和Co（1 nm）/Mn1.5Ga界面的元素特异性磁性。我们发现，在Fe和Co层的自旋耦合和平行于那些在Mn1.5Ga的生长条件下，而在350 °C的后退火改变了界面磁耦合反铁磁的Co。在每个XMCD吸收边的元素特定的磁滞曲线显示大矫顽场的Fe和Co通过与Mn1.5Ga的交换耦合。退火处理后的XMCD谱线形状表明，界面反应促进了Mn 2CoGa类二次合金的形成，这影响了利用过渡金属和MnGa之间的界面的隧道磁电阻的性能。
We investigated the element-specific magnetic properties at interfaces of Fe (1 nm)/Mn1.5Ga and Co (1 nm)/Mn1.5Ga using X-ray magnetic circular dichroism (XMCD). We found that the spins in the Fe and Co layers were coupled with and parallel to those in the Mn1.5Ga under the as-grown conditions, while the post-annealing at 350 °C changed the interface magnetic coupling to antiferromagnetic in Co. The element-specific hysteresis curves at each XMCD absorption edge revealed large coercive fields in Fe and Co through the exchange coupling with Mn1.5Ga. After the annealing process, XMCD spectral line shapes indicate that the interfacial reactions promote the formation of Mn2CoGa-like secondary alloys, which influences the performance of tunnel magnetoresistance using the interfaces between transition metals and MnGa.