Uniaxial Magnetic Anisotropy in Amorphous CoFeB Films on Different Orientational GaAs Substrates

Author

Tu, H.Q. ; You, B. ; Zhang, Y.Q. ; Gao, Y. ; Xu, Y.B. ; Du, J.

Author_Institution

Dept. of Phys. & Collaborative Innovation, Nanjing Univ., Nanjing, China

Volume

51

Issue

11

fYear

2015

Firstpage

1

Lastpage

4

Abstract

In-plane uniaxial magnetic anisotropy (UMA) has been carefully studied for the same amorphous Co₅₆Fe₂₄B₂₀ (CoFeB) film deposited on different orientational GaAs substrates. It was noted that a strong uniaxial anisotropy field (H_k) of ~270 Oe could be achieved with CoFeB film grown on GaAs(001) substrate, which is much larger than the largest value (150 Oe) reported before. In contrast, H_k was <;20 Oe when the same CoFeB film was deposited on (110) or (111) GaAs substrate. The angular dependence of H_k also behaved quite differently in these CoFeB films. Based on the surface morphology of the CoFeB/GaAs films, the possible mechanisms responsible for the different behavior of UMA were briefly discussed in terms of bond-orientational anisotropy model and random anisotropy model.

Keywords

amorphous magnetic materials; boron alloys; cobalt alloys; ferromagnetic materials; iron alloys; magnetic anisotropy; magnetic thin films; metallic thin films; surface morphology; (110) GaAs substrate; (111) GaAs substrate; Co₅₆Fe₂₄B₂₀; GaAs; GaAs(001) substrate; amorphous CoFeB films; angular dependence; bond-orientational anisotropy model; in-plane uniaxial magnetic anisotropy; orientational GaAs substrates; random anisotropy model; surface morphology; uniaxial anisotropy field; Anisotropic magnetoresistance; Films; Gallium arsenide; Iron; Magnetic anisotropy; Substrates; Surface morphology; Bond-orientational Anisotropy; Bond-orientational anisotropy (BOA); Random Anisotropy; Uniaxial Magnetic Anisotropy; random anisotropy; uniaxial magnetic anisotropy (UMA);

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2015.2441719

Filename

7118207