离子辐照诱导钴/氧化钴异质结构:打印三维界面
摘要
将铁磁(FM)层与非铁磁层分隔开的界面由于自旋轨道耦合和对称性破缺而具有独特性质,产生交换偏置、垂直磁各向异性、自旋泵浦、自旋转移力矩、电荷与自旋电流相互转换等效应。这些界面现象在磁数据存储与传输应用中起着关键作用,其要求形成嵌入非铁磁基体中的FM纳米结构。本文研究了通过离子辐照制备此类纳米结构的可能性。我们研究了横向限域对离子辐照诱导非磁性金属氧化物(如反铁磁或顺磁性)还原形成铁磁金属的影响。随后利用上述发现,通过对CoO/Pt多层膜进行空间选择性辐照,构建了Co、CoO与Pt之间的三维磁界面。我们证明,O原子的机械位移在从绝缘非铁磁氧化钴还原为金属钴的过程中起关键作用。金属钴在所生成的Co/Pt纳米结构中产生垂直磁各向异性,并在低温下于Co与CoO的垂直界面处产生交换偏置。若将离子辐照技术推向极限,该方法原则上可实现致密排布、原子尺度的铁磁点接触自旋力矩振荡器(STO)网络,或用于基于限流路径的电流垂直面巨磁阻读头的导电通道。
引用
@article{arxiv.2002.08090,
title = {Ion-Irradiation-Induced Cobalt/Cobalt Oxide Heterostructures: Printing 3D Interfaces},
author = {Oğuz Yıldırım and Donovan Hilliard and Sri Sai Phani Kanth Arekapudi and Ciarán Fowley and Hamza Cansever and Leopold Koch and Lakshmi Ramasubramanian and Shengqiang Zhou and Roman Böttger and Jürgen Lindner and Jürgen Faßbender and Olav Hellwig and Alina M. Deac},
journal= {arXiv preprint arXiv:2002.08090},
year = {2020}
}
备注
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces copyright \c{opyright} American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https:// pubs.acs.org/articlesonrequest/AOR-rPGr2e7nZ7tzzwK3tnBZ