Lattice Softening in Metastable bcc Co x Mn 100 - x (001) Ferromagnetic Layers for a Strain-Free Magnetic Tunnel Junction
Lattice Softening in Metastable bcc Co x Mn 100 - x (001) Ferromagnetic Layers for a Strain-Free Magnetic Tunnel Junction
复制标题
用于无应变磁隧道结的亚稳态 bcc Co x Mn 100 - x (001) 铁磁层中的晶格软化
DOI：
10.1103/physrevapplied.16.054052
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发表时间：
2021
影响因子：
4.6
通讯作者：
Elphick K
中科院分区：
文献类型：
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作者：
Elphick K
在自旋电子学中，一个长期存在的问题是为什么基于磁隧道结（MTJ）几乎是在室温下实现大隧道磁电阻（TMR）比的唯一选择，尽管这并不像理论预测的那么大。本研究的重点是利用亚稳bcc（）铁磁薄膜开发一种几乎无菌株的MTJ。我们研究了MTJs的结晶程度，包括与它们的TMR比率的关系。高分辨透射电镜显示，在室温下，这些层的晶格常数在66≤x≤83时几乎一致，TMR比高达229%，证实了层的软性质，在界面处有一些位错。初始计算证实了晶体在很宽的成分范围内的变形稳定性，证明了在更大的TMR比下无应变界面的优势。
In spintronics, one of the long-standing questions is why the-based magnetic tunnel junction (MTJ) is almost the only option for achieving a large tunneling magnetoresistance (TMR) ratio at room temperature, although this is not as large as the theoretical prediction. This study focuses on the development of an almost strain-free MTJ using metastable bcc() ferromagnetic films. We investigate the degree of crystallization in MTJs consisting ofin relation to their TMR ratios. Cross-section high resolution transmission electron microscopy reveals that almost consistent lattice constants of these layers for 66 ≤x≤ 83 with large TMR ratios of 229% at room temperature, confirming the soft nature of thelayer with some dislocations at theinterfaces.Ab initiocalculations confirm the crystalline deformation stability across a broad compositional range in, proving the advantage of a strain-free interface for much larger TMR ratios.