Title :
Anomalous magnetic behaviour of nanocrystalline FeTaC films at high temperature
Author :
Miura, Michiyori ; Obata, Akihisa ; Noro, Yoshihiko
Author_Institution :
Hitachi, Ltd., Totsuka, Japan
fDate :
11/1/1993 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
