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Enhancement of Spin Pumping from CoFeB to Sb2Te3 Layers by Crystal Orientation Control
Physica Status Solidi-Rapid Research Letters ( IF 2.8 ) Pub Date : 2021-06-18 , DOI: 10.1002/pssr.202100247
Misako Morota 1 , Yuta Saito 1, 2 , Noriyuki Uchida 1, 2, 3
Affiliation  

Sb2Te3 is well known as a phase-change material, and is expected to exhibit high spin–charge current conversion because of its strong spin–orbit interactions. Reversible phase-change characteristics enable manipulation of physical properties depending on phase. Therefore, it is anticipated that its spin properties can also be tuned by controlling the phases of Sb2Te3, promising great potential for novel spintronic devices. However, the effects of crystallinity on the spin properties of Sb2Te3 have not yet been investigated. Herein, the spin relaxation induced by the spin-pumping effect in CoFeB/Sb2Te3 bilayers is examined using ferromagnetic resonance (FMR) at 300 K for crystalline and amorphous Sb2Te3. FMR signal width enhancement is observed for the highly oriented crystalline Sb2Te3 film at thickness less than 7 nm. In contrast, the FMR signal widths of the amorphous sample are independent of the layer thickness. The significant increase in linewidth suggests more efficient spin injection from the ferromagnetic CoFeB layer into crystalline Sb2Te3 than into amorphous Sb2Te3. This stark contrast between the spin dynamics of the amorphous and crystalline Sb2Te3 films supports the idea that spin conduction can be tuned by controlling the crystal orientation of Sb2Te3 films.

中文翻译:

通过晶体取向控制增强从 CoFeB 到 Sb2Te3 层的自旋泵浦

Sb 2 Te 3是众所周知的相变材料,由于其强自旋-轨道相互作用,有望表现出高自旋-电荷电流转换。可逆相变特性使得能够根据相操纵物理特性。因此,预计它的自旋特性也可以通过控制 Sb 2 Te 3的相来调节,有望成为新型自旋电子器件的巨大潜力。然而,尚未研究结晶度对 Sb 2 Te 3的自旋性质的影响。在此,CoFeB/Sb 2 Te 3 中自旋泵浦效应引起的自旋弛豫使用铁磁共振 (FMR) 在 300 K 下检查晶体和非晶 Sb 2 Te 3 的双层。对于厚度小于 7 nm的高度取向的结晶 Sb 2 Te 3膜,观察到 FMR 信号宽度增强。相比之下,非晶样品的 FMR 信号宽度与层厚度无关。线宽的显着增加表明从铁磁 CoFeB 层到晶体 Sb 2 Te 3 的自旋注入比到非晶 Sb 2 Te 3 更有效。非晶态和结晶态 Sb 2 Te 3的自旋动力学之间形成鲜明对比薄膜支持可以通过控制 Sb 2 Te 3薄膜的晶体取向来调节自旋传导的想法。
更新日期:2021-06-18
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