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Significant Strain‐Induced Orbital Reconstruction and Strong Interfacial Magnetism in TiNi(Nb)/Ferromagnet/Oxide Heterostructures via Oxygen Manipulation
Author(s) -
Feng Chun,
Wang Shiru,
Yin Li,
Li Xujing,
Yao Mingke,
Yang Feng,
Tang Xiaolei,
Wang Lei,
Mi Wenbo,
Yu Guanghua
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201803335
Subject(s) - materials science , magnetism , heterojunction , strain engineering , ferromagnetism , oxide , shape memory alloy , anisotropy , coupling (piping) , condensed matter physics , nanotechnology , optoelectronics , composite material , optics , metallurgy , physics , silicon
Dynamical manipulation of oxygen ion (O 2− ) 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 O 2− dynamical behavior and related interface characteristics. Here, an alternative strategy is reported to modulate O 2− 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 O 2− migration in a nonvolatile manner. The O 2− 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.