Magnetic Properties of Cobalt Ferrite (001) Films Grown on Spinel-Type Buffer Layers

Author

Hisamatsu, Yuki ; Niizeki, Tomohiko ; Yanagihara, Hideto ; Kita, Eiji

Author_Institution

Inst. of Appl. Phys., Univ. of Tsukuba, Tsukuba, Japan

Volume

51

Issue

11

fYear

2015

Firstpage

1

Lastpage

4

Abstract

To improve the interface magnetism of Co_xFe_3-xO₄ (CFO) films that are grown on MgO substrates and exhibit extremely large perpendicular magnetic anisotropy, we attempted to insert two different spinel-type oxides [CoCr₂O₄ (CCO) and MgTi₂O₄ (MTO)] between the CFO films and their MgO(001) substrates. Although both buffer layers were epitaxially grown on MgO(001), the CFO films grown on CCO/MgO(001) became polycrystalline with a significantly lower level of magnetization, while the magnetization of the CFO films on MTO/MgO(001) fell as a function of the thickness of the MTO layer. A secondary ion mass spectroscopy analysis revealed a remarkable interdiffusion of Co and Mg.

Keywords

buffer layers; chemical interdiffusion; cobalt compounds; ferrites; interface magnetism; magnesium compounds; magnetic epitaxial layers; magnetostriction; perpendicular magnetic anisotropy; secondary ion mass spectra; sputter deposition; vapour phase epitaxial growth; Co_xFe_3-xO₄-MgO; MTO layer thickness; MgO; MgO(001) substrates; cobalt ferrite (001) films; epitaxial growth; interdiffusion; interface magnetism; magnetic properties; magnetization; perpendicular magnetic anisotropy; polycrystalline material; secondary ion mass spectroscopy; spinel-type buffer layers; Buffer layers; Epitaxial growth; Perpendicular magnetic anisotropy; Saturation magnetization; Substrates; Ferrite films; Magnetic anisotropy; Magnetostriction; magnetic anisotropy; magnetostriction;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2015.2448598

Filename

7131553