Title :
Transition to superparamagnetism in a Cr-containing FINEMET-type alloy
Author :
Franco, V. ; Conde, C.F. ; Conde, A. ; Kiss, L.F. ; Kemny, T.
Author_Institution :
Condensed Matter Phys. Dept., Sevilla Univ., Spain
fDate :
9/1/2002 12:00:00 AM
Abstract :
The transition from a ferromagnetic to a superparamagnetic regime has been studied in a Cr-containing FINEMET-type alloy. Cr enhances the thermal stability of the alloy against nanocrystallization and reduces the Curie temperature of the remaining amorphous phase. Above room temperature, the temperature dependent hysteresis loop of a nanocrystalline sample can be described by a model of interacting superparamagnetic particles. The temperature dependence of the apparent magnetic moment of the particles obtained from the fittings is interpreted in an extended version of the model.
Keywords :
Curie temperature; amorphous magnetic materials; boron alloys; chromium alloys; copper alloys; crystallisation; ferromagnetic materials; iron alloys; magnetic hysteresis; magnetic moments; magnetic particles; magnetic transitions; nanostructured materials; niobium alloys; silicon alloys; superparamagnetism; thermal stability; Cr-containing FINEMET-type alloy; Curie temperature; Fe63.5Cr10Si13.5B9CuNb3; Fe63.5Cr10Si13.5B9CuNb3 amorphous ribbon; amorphous phase; apparent magnetic moment; coercivity; extended version; ferromagnetic to superparamagnetic regime transition; hysteresis; interacting superparamagnetic particles; nanocrystalline sample; nanocrystallization; room temperature; soft magnetic nanocrystalline alloys; temperature dependent hysteresis loop; thermal stability; Amorphous magnetic materials; Amorphous materials; Anisotropic magnetoresistance; Crystallization; Grain size; Magnetic anisotropy; Magnetostriction; Perpendicular magnetic anisotropy; Soft magnetic materials; Temperature dependence;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.802115
