Structure and Magnetic Properties of Co Epitaxial Thin Films Grown on MgO Single-Crystal Substrates

Author

Nukaga, Yuri ; Ohtake, Mitsuru ; Futamoto, Masaaki ; Kirino, Fumiyoshi ; Fujita, Norihito ; Inaba, Nobuyuki

Author_Institution

Fac. of Sci. & Eng., Chuo Univ., Tokyo

Volume

45

Issue

6

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

2519

Lastpage

2522

Abstract

Co epitaxial thin films were prepared on single-crystal MgO substrates of (100), (110), and (111) planes heated at 300degC by ultra high vacuum molecular beam epitaxy. The film crystal structure varies depending on the substrate orientation. On MgO(100) substrate, a Co(112macr0) epitaxial bi-crystalline film with an hcp structure is obtained. A Co(110) single-crystal film with an fcc structure is formed on MgO(110) substrate, whereas a Co(0001) single-crystal film with an hcp structure is grown on MgO(111) substrate. Co film growth on MgO substrates follows the Volmer-Weber mode. The in-plane magnetization properties reflect the magnetocrystalline anisotropy of bulk hcp-Co or fcc-Co crystal. The Gilbert´s damping constants of these 40-nm-thick epitaxial Co films are determined.

Keywords

cobalt; crystal structure; damping; magnetic anisotropy; magnetic epitaxial layers; molecular beam epitaxial growth; surface magnetism; vacuum deposition; (100) planes; (110) planes; (111) planes; (112macr0)epitaxial thin films; Co(0001); Co(110); Co-MgO; Gilbert damping constants; MgO; Volmer-Weber mode; crystal structure; epitaxial bi-crystalline film; hcp structure; in-plane magnetization; magnetic properties; magnetocrystalline anisotropy; single-crystal substrates; size 40 nm; substrate orientation; temperature 300 C; ultra-high vacuum molecular beam epitaxy; Co thin film; FMR; epitaxial growth; single-crystal substrate;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2009.2018643

Filename

4957816