Title :
Frequency-domain thermo-magnet memory effect in the Co75-x FexSi15B10 alloys
Author :
Turtelli, R. Sato ; Machado, F.L.A.
Author_Institution :
Inst. de Fisica, Univ. Estadual de Campinas, Sao Paulo, Brazil
fDate :
9/1/1989 12:00:00 AM
Abstract :
The authors report the first observation of a frequency-dependent memory effect in the thermal history of the AC magnetic permeability in the as-quenched Co75-xFexSi15B10 alloys. The frequency-domain thermomagnetic memory effect (FDTMME) was observed for x≲25. For higher concentrations the samples crystallize at temperatures lower than the magnetic critical temperature, which greatly reduces the magnetic permeability. The frequency-dependent memory effect is discussed in terms of an existing model for the time response of the magnetic permeability which is based on the domain structure of amorphous materials. The FDTMME shows great potential for development of frequency coding and decoding memory devices
Keywords :
boron alloys; cobalt alloys; ferromagnetic properties of substances; iron alloys; magnetic domains; magnetic hysteresis; magnetic permeability; magnetic properties of amorphous substances; metallic glasses; silicon alloys; thermomagnetic recording; AC magnetic permeability; Co75-xFexSi15B10 alloys; FDTMME; amorphous materials; as-quenched alloys; decoding memory devices; domain structure; frequency coding memory device; frequency-dependent memory effect; frequency-domain thermomagnetic memory effect; magnetic critical temperature; thermal history; thermal hysteresis; time response model; Amorphous magnetic materials; Cobalt alloys; Crystallization; Frequency; History; Iron alloys; Magnetic domains; Permeability; Silicon alloys; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
