Anomalous shift of magnetic resonance line in disordered and noncollinear magnetics

Author

Minakov, A.A. ; Lesnikh, Yu.I.

Author_Institution

Gen. Phys. Inst., Moscow, Russia

Volume

30

Issue

2

fYear

1994

fDate

3/1/1994 12:00:00 AM

Firstpage

985

Lastpage

987

Abstract

It is established that anomalous shift of magnetic resonance line in spin glasses is a general feature of noncollinear magnetics, and it is observed in helical antiferromagnetics too. The shift appears with appearing of a noncollinear magnetic short-range order. A nonuniform spin precession is excited in noncollinear magnetics. An effective exchange field acts on a spin under nonuniform precession. Using hydrodynamic theory of spin waves in spin glasses, it is shown that the value of the shift may be of the order of the resonance field, if a certain parameter, characterizing the degree of noncollinearity of the spin structure, is of the order of unity

Keywords

antiferromagnetism; cadmium compounds; chromium compounds; exchange interactions (electron); magnetic semiconductors; paramagnetic resonance; spin glasses; spin waves; ternary semiconductors; zinc compounds; (CdZn)Cr₂Se₄; anomalous shift; disordered magnetics; effective exchange field; helical antiferromagnetics; hydrodynamic theory; magnetic resonance line; magnetic short-range order; noncollinear magnetics; nonuniform spin precession; spin glasses; spin waves; Antiferromagnetic materials; Chromium; Crystals; Glass; Lattices; Magnetic anisotropy; Magnetic resonance; Paramagnetic resonance; Temperature; Zinc;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.312466

Filename

312466