Anomalous magnetic behaviour of nanocrystalline FeTaC films at high temperature

Author

Miura, Michiyori ; Obata, Akihisa ; Noro, Yoshihiko

Author_Institution

Hitachi, Ltd., Totsuka, Japan

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

3049

Lastpage

3051

Abstract

The magnetic properties of nanocrystalline Fe₇₉Ta₁₀C₁₁ films with different crystallographic characteristics are studied. The soft magnetic properties are not related to the Fe characteristics, but are closely related to the TaC characteristics, such as the lattice parameter and grain size. The film, composed of fine TaC grain with a small lattice parameter, has excellent soft magnetic characteristics at room temperature and its magnetic properties change little with temperature. On the contrary, the film composed of large TaC grain with a large lattice parameter has a large coercive force and magnetostriction at room temperature and exhibits a anomalous magnetic behavior at high temperature. The coercive force at 300°C becomes ten times larger than that at room temperature. This phenomenon is most likely caused by the disappearance of the intergranular ferromagnetic coupling

Keywords

X-ray diffraction examination of materials; coercive force; ferromagnetic properties of substances; grain size; iron alloys; lattice constants; magnetic thin films; magnetisation; magnetostriction; nanostructured materials; tantalum alloys; 30 min; 300 C; 600 C; Fe₇₉Ta₁₀C₁₁ nanocrystalline film; X-ray diffraction; annealing; anomalous magnetic behavior; coercive force; crystallographic characteristics; grain size; intergranular ferromagnetic coupling; lattice parameter; magnetostriction; saturation magnetisation; soft magnetic properties; Coercive force; Crystallography; Grain size; Iron; Lattices; Magnetic films; Magnetic properties; Magnetostriction; Soft magnetic materials; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.281113

Filename

281113