Variation of structure and magnetic properties by Ag addition in (001) oriented CoPt and CoPd alloy film

2015 IEEE Magnetics Conference (INTERMAG) Pub Date : 2015-07-16 DOI:10.1109/INTMAG.2015.7156686

T. Nagata, Y. Tokuoka, T. Kato, D. Oshima, S. Iwata

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Abstract

Tetragonal L10 phase magnetic materials, e.g., FePt and CoPt, have been extensively studied as potential candidates for future high-density perpendicular recording media. However, for the practical application of these materials, there still remain challenges such as fabrication of nano-sized grains, control of (001) orientation, and lowering the ordering temperature of L10 phase. One of the effective ways to realize these requirements is the addition of the third element, and Ag is known to be one of the effective elements to tailor the magnetic properties and ordering temperature of L10-FePt [1-3]. We have previously studied the effect of Ag addition in L10-FePt and L10-FePd, and found a significant difference in the effect of Ag addition between FePt and FePd; for FePt, Ag addition enhanced the coercivity and promoted L10 ordering, while for FePd, Ag addition lowered the coercivity. In this study, CoPt-Ag and CoPd-Ag systems have been studied in detail for the systematic understanding of the effect of Ag addition in 3d transition metal and noble metal alloy films.

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(001)取向CoPt和CoPd合金薄膜中Ag的加入对其结构和磁性能的影响

四方L10相磁性材料，如FePt和CoPt，作为未来高密度垂直记录介质的潜在候选材料已被广泛研究。然而，这些材料的实际应用还面临着纳米级晶粒的制备、(001)取向的控制、L10相有序温度的降低等挑战。实现这些要求的有效方法之一是添加第三元素，而Ag被认为是调整L10-FePt的磁性和有序温度的有效元素之一[1-3]。我们之前研究了Ag在L10-FePt和L10-FePd中的添加效果，发现Ag在FePt和FePd中的添加效果有显著差异;对于FePt, Ag的加入提高了矫顽力，促进了L10的有序，而对于FePd, Ag的加入降低了矫顽力。本研究对CoPt-Ag和CoPd-Ag体系进行了详细的研究，以系统地了解Ag在三维过渡金属和贵金属合金薄膜中的作用。

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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2015 IEEE Magnetics Conference (INTERMAG)

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