DocumentCode :
1003159
Title :
Correlated spin glass: A new way to extremely soft magnetic materials
Author :
Chudnovsky, E.M. ; Serota, R.A.
Author_Institution :
Prospekt Gagarina, Kharkov, USSR
Volume :
20
Issue :
5
fYear :
1984
fDate :
9/1/1984 12:00:00 AM
Firstpage :
1400
Lastpage :
1402
Abstract :
We consider amorphous solids with ferromagnetic exchange and small random anisotropy. In the absence of an applied field or coherent anisotropy these solids are characterized by zero net magnetization and smooth stochastic rotation of the local magnetization. The ferromagnetic correlation length R is large compared with the random anisotropy correlation length r: R \\cong r\\Lambda _{r}^{-2} where \\Lambda _{r} = r^{2}K_{r}/A\\ll1 . Krand A are the random anisotropy and exchange energies. This soft amorphous state should have a large zero field susceptibility \\chi , a low spin resonance frequency, \\omega _{o}-\\chi ^{-1}\\gamma M_{o} , and should show a square root magnetization law, (Mo-M(H))∼ H-1/2for a wide range of applied fields. Coherent anisotropy K_{u}> \\chi ^{-1} transforms the randomly ordered state into one with ferromagnetic domains and reduces the susceptibility.
Keywords :
Amorphous magnetic materials/devices; Soft magnetic materials/devices; Amorphous materials; Anisotropic magnetoresistance; Glass; Magnetic resonance; Magnetic susceptibility; Magnetization; Resonant frequency; Soft magnetic materials; Solids; Stochastic processes;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1984.1063203
Filename :
1063203
Link To Document :
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