Co-Ferrite Thin Films With Perpendicular Magnetic Anisotropy

Author

Xiaoxi Liu ; Shirasath, Sagar ; Shindoh, Kensuke

Author_Institution

Fac. of Eng., Shinshu Univ., Nagano, Japan

Volume

51

Issue

11

fYear

2015

Firstpage

1

Lastpage

4

Abstract

Co-ferrite thin film with spinel structure is attractive for spintronics and multifunctional devices. So far, single-crystal substrates are necessary to introduce perpendicular magnetic anisotropy in co-ferrite films. In this paper, a unique process has been developed to deposit co-ferrite thin films onto thermally oxidized silicon wafer with perpendicular magnetic anisotropy. We have successfully prepared co-ferrite films with (00l) orientation. Those films show perpendicular coercivities as large as 12.8 kOe. X-ray diffractometry results revealed that compressive strain, which is introduced by the postannealing process rather than deposition process, is as large as 1.3% in films with (00l) orientation. The large coercivity and perpendicular magnetic anisotropy can be quantitatively explained by the magnetoelastic effect. This silicon-compatible fabrication process is useful to further extending the applications of co-ferrite films.

Keywords

X-ray diffraction; annealing; cobalt compounds; compressive strength; ferrites; magnetic thin films; magnetoelastic effects; perpendicular magnetic anisotropy; sputter deposition; (00l) orientation; Co-ferrite thin films; CoFe₂O₄; SiO₂; X-ray diffractometry; compressive strain; magnetoelastic effect; multifunctional devices; perpendicular coercivities; perpendicular magnetic anisotropy; post-annealing process; silicon-compatible fabrication process; single-crystal substrates; spinel structure; spintronics; thermally oxidized silicon wafer; Coercive force; Films; Magnetic domains; Magnetic resonance imaging; Probes; Saturation magnetization; Sputtering; Co-ferrite; Magnetic force microscope; high coercivity; magnetoelastic effect; perpendicular magnetic anisotropy; silicon-compatible fabrication;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2015.2436394

Filename

7111358