Tunable perpendicular magnetic anisotropy in GdFeCo amorphous films

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:339

Article

Ding, Manli¹  Poon, S. Joseph¹ 

[1] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA

关键词: Magnetic compensation;    RE-TM ferromagnetic alloy;    Perpendicular magnetic anisotropy;   

DOI  :  10.1016/j.jmmm.2013.03.007

来源: Elsevier

【 摘 要 】

We report the compositional and temperature dependence of magnetic compensation in amorphous ferrimagnetic GdxFe93-xCo7 alloy films. Magnetic compensation is attributed to the competition between antiferromagnetic coupling of rare-earth (RE) with transition-metal (TM) ions and ferromagnetic interaction between the TM ions. The low-Gd region of x between 20 and 34 was found to exhibit compensation phenomena characterized by a low saturation magnetization and perpendicular magnetic anisotropy (PMA) near the compensation temperature. Compensation temperature was not observed in previously unreported high-Gd region of x=52-59, in qualitative agreement with results from recent model calculations. However, low magnetization was achieved at room temperature, accompanied by a large PMA with coercivity reaching similar to 6.6 kOe. The observed perpendicular magnetic anisotropy of amorphous GdFeCo films probably has a structural origin consistent with certain aspects of the atomic-scale anisotropy. Our findings have broadened the composition range of transition metal-rare earth alloys for designing PMA films, making it attractive for tunable magnetic anisotropy in nanoscale devices. (c) 2013 Elsevier B.V. All rights reserved.

【 授权许可】

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