Influence of Pt Ultrathin Interlayers on Magnetic Anisotropy in Ni/NiO Multilayers

Micro Pub Date : 2024-02-29 DOI:10.3390/micro4010011

D. I. Anyfantis, A. Barnasas, Nikolaos C. Diamantopoulos, Constantinos M. Tsakiris, Georg Schmidt, E. Papaioannou, Panagiotis Poulopoulos

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Abstract

Perpendicular magnetic anisotropy at transition metal/oxide interfaces plays a significant role in technological applications such as magnetic storage and spintronics. In this study, we investigate the effects of thermal annealing and Pt ultrathin interlayers on the magnetic anisotropy in Ni/NiO multilayers. Ni/NiO/Pt multilayers were fabricated via radiofrequency magnetron sputtering and natural oxidation. The static magnetic properties of the samples were studied using temperature-dependent SQUID magnetometry. We focus on a sample with a Nickel thickness of 6.7 nm in each multilayer period. This multilayer in Ni/NiO form showed the maximum enhancement of perpendicular magnetic anisotropy after mild thermal annealing in past work. In this work, we study the effects of ultrathin Pt interlayers on the magnetic properties of such a Ni/NiO multilayer before and after annealing. We have observed a further increase in perpendicular magnetic anisotropy, and we study the temperature-dependent magnetic properties of this system, which combines the favorable magnetic properties of Ni/Pt and Ni/NiO multilayers.

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铂超薄夹层对 Ni/NiO 多层膜磁各向异性的影响

过渡金属/氧化物界面的垂直磁各向异性在磁存储和自旋电子学等技术应用中发挥着重要作用。在本研究中，我们研究了热退火和铂超薄夹层对 Ni/NiO 多层膜磁各向异性的影响。镍/氧化镍/铂多层膜是通过射频磁控溅射和自然氧化制得的。我们使用随温度变化的 SQUID 磁强计研究了样品的静态磁特性。我们重点研究了每个多层期的镍厚度为 6.7 nm 的样品。在过去的工作中，这种镍/氧化镍形式的多层在温和热退火后显示出垂直磁各向异性的最大增强。在这项工作中，我们研究了超薄铂夹层在退火前后对这种 Ni/NiO 多层磁性能的影响。我们观察到垂直磁各向异性进一步增加，并研究了该系统随温度变化的磁特性，它结合了 Ni/Pt 和 Ni/NiO 多层的有利磁特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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