Significant Strain-Induced Orbital Reconstruction and Strong Interfacial Magnetism in TiNi(Nb)/Ferromagnet/Oxide Heterostructures via Oxygen Manipulation
Significant Strain-Induced Orbital Reconstruction and Strong Interfacial Magnetism in TiNi(Nb)/Ferromagnet/Oxide Heterostructures via Oxygen Manipulation
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DOI：
10.1002/adfm.201803335
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发表时间：
2018-09-12
影响因子：
19
通讯作者：
Yu, Guanghua
中科院分区：
文献类型：
--
作者：
Feng, Chun;Wang, Shiru;Yu, Guanghua
金属/氧化物异质界面上氧离子（O2-）的动态操纵已被广泛证明可以调整许多物理和化学性质，并显着促进创造新的功能。传统的工作主要集中在O2-动力学行为和相关界面特性的电控制上。在这里，报道了一种替代策略，通过形状记忆效应引起的显着应变来调节 O2 传输和界面磁性，这与传统的磁弹性耦合机制不同。通过驱动 TiNi(Nb) 形状记忆合金基体中的马氏体向奥氏体转变，对 Pt/Co/MgO 异质结构施加显着且可调的应变，从而以非挥发性方式促进界面 O2 迁移。 O2-迁移引起Co的轨道重构，显着调整轨道磁性，从而将界面磁各向异性能量增强两倍，达到惊人的0.95 erg cm(-2)。此外，通过改变Co厚度的复杂应变工程，整体磁各向异性可以从面内到垂直方向广泛调节。这项工作开发了一种非电氧操纵方法，用于普遍定制离子控制的界面特性，并阐明了磁离子耦合起源，以丰富与氧相关的轨道物理和功能器件应用。
Dynamical manipulation of oxygen ion (O2-) at metal/oxide heterointerfaces is widely demonstrated to tailor numerous physical and chemical properties and facilitate creating novel functionalities significantly. The traditional works mainly focus on electric control of O2- dynamical behavior and related interface characteristics. Here, an alternative strategy is reported to modulate O2- transport and interfacial magnetism via a significant strain induced by shape memory effect, which is different from the conventional magnetoelastic coupling mechanism. By driving the martensite to austenite transition in TiNi(Nb) shape memory alloy substrates, a significant and tunable strain is exerted on Pt/Co/MgO heterostructure, which promotes interfacial O2- migration in a nonvolatile manner. The O2- migration induces an orbital reconstruction of Co to tune the orbital magnetism noticeably, which strengthens the interfacial magnetic anisotropy energy by two times to a striking value of 0.95 erg cm(-2). Besides, the overall magnetic anisotropy is broadly tunable from in-plane to perpendicular direction by an elaborate strain engineering with changing Co thickness. This work develops a nonelectrical oxygen manipulation for tailoring ion-controlled interfacial properties universally and also clarifies the magnetoionic coupling origin for enriching the oxygen-related orbital physics and functional device applications.