Pinning-assisted out-of-plane anisotropy in reverse stack FeCo/FePt intermetallic bilayers for controlled switching in spintronics

JOURNAL OF ALLOYS AND COMPOUNDS

卷:877

Article

Vashisht, Garima¹  Shashank, Utkarsh²  Gupta, Surbhi²  Medwal, Rohit³  Dong, C. L.⁴  Chen, C. L.⁵  Asokan, K.⁶  Fukuma, Y.²  Annapoorni, S.¹ 

[1] Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India

[2] Kyushu Inst Technol, Fac Comp Sci & Syst Engn, Dept Phys & Informat Technol, Iizuka, Fukuoka 8208502, Japan

[3] Nanyang Technol Univ, Natl Inst Educ, Nat Sci & Sci Educ, Singapore 637616, Singapore

[4] Tamkang Univ, Dept Phys, Tamsui 251, Taiwan

[5] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[6] Inter Univ Accelerator Ctr, Mat Sci Div, Aruna Asaf Ali Marg, New Delhi 110067, India

关键词: Exchange-spring;    Anisotropy;    Interface;    Pinning;    Gilbert damping;    Charge transfer;   

DOI  :  10.1016/j.jallcom.2021.160249

来源: Elsevier

【 摘 要 】

We study the implications of FeCo underlayer and overlayer on the static and dynamic magnetic properties of FeCo/FePt exchange spring system along with post-annealing kinetics. Probing of FePt/FeCo/Si and FeCo/ FePt/Si bilayers using high energy synchrotron X-ray diffraction by varying glancing angles unveiled structural variations at the interface, where FeCo is observed to inhibit the crystalline growth of FePt. A soft ferromagnetic in-plane behavior and defect-driven hard ferromagnetic properties in the out-plane con -figuration are established. Besides, the magnetization dynamics studied by Ferromagnetic Resonance de-picts an out-plane magnetization component of FePt only in FeCo/FePt/Si. X-ray Absorption Spectroscopy (XAS) in the Fe, Co and Pt L-edge regions reveal dissimilar interfaces in the two series due to thermal agitation effects. XAS spectra at Fe and Co K-edges ensure similar local coordination of Co immaterial of stack order, contrary to altered local geometry of Fe observed in the two series ascribed to varied crys-tallinity of FePt. Such structures are useful for spin-wave assisted low field magnetization switching in highly coercive FePt by using exchange coupled soft FeCo. (c) 2021 Elsevier B.V. All rights reserved.

【 授权许可】

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