LSPM-CNRS, Université Paris XIII-Sorbonne Paris Cité, 93430, Villetaneuse, France.
Information Storage Materials Laboratory, Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 117576, Singapore.
Sci Rep. 2018 Sep 12;8(1):13695. doi: 10.1038/s41598-018-32149-z.
This article presents a study whose purpose is to elucidate the damage effects in thin films on their magnetic response. CoFeB and NiFe films of different nanometric thicknesses were stretched by more than 10% and in situ probed by atomic force microscopy measurements to determine their irreversible mechanical behavior (multi-cracking, buckling). Once these phenomena have been well identified, magnetic behavior of these stretched systems has been studied by ferromagnetic resonance to measure resulting magnetic anisotropy and damping evolutions. All of these experimental studies show that the magnetic properties are mainly affected by the stresses generated during the damage but not by the local discontinuities induced by the numerous cracks and buckles. This is in particular confirmed by the almost zero sensitivity to the damage of the magnetic properties of NiFe alloy which is known for its vanishing magnetostriction.
本文介绍了一项旨在阐明薄膜中损伤效应及其对磁响应影响的研究。研究对不同纳米厚度的 CoFeB 和 NiFe 薄膜进行了超过 10%的拉伸，并通过原子力显微镜测量对其进行了原位探测，以确定其不可逆的机械行为（多裂纹、屈曲）。一旦这些现象得到很好的识别，就通过铁磁共振研究这些拉伸系统的磁行为，以测量产生的磁各向异性和阻尼演变。所有这些实验研究表明，磁性主要受到损伤过程中产生的应力的影响，而不是由大量裂纹和屈曲引起的局部不连续性的影响。NiFe 合金的磁性能对损伤几乎没有敏感性，这一点尤其得到了证实，因为 NiFe 合金的磁致伸缩系数几乎为零。
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