FMR OF SINGLE-CRYSTAL MNAS1-DELTA

Authors
PAPE J SCHUNEMANN JW RAGER H SONDERMANN U BARNER K
Citation
J. Pape et al., FMR OF SINGLE-CRYSTAL MNAS1-DELTA, Physica status solidi. a, Applied research, 144(1), 1994, pp. 203-215
Citations number
25
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica status solidi. a, Applied research → ACNP
ISSN journal
00318965
Volume
144
Issue
1
Year of publication
1994
Pages
203 - 215
Database
ISI
SICI code
0031-8965(1994)144:1<203:FOSM>2.0.ZU;2-D
Abstract
Microwave absorption in MnAs poly- and single crystals below T(u) are identified as FMR whose resonance frequencies are determined by magnet ocrystalline anisotropy. It is found that K1 = -5.7 x 10(5) J/m3; K2 = 2.1 x 10(5) J/m3; K3 = -2.0 x 10(5) J/m3 in accord with the literatur e. The FMR linewidths are unusually large, suggesting a distribution o f exchange couplings and an additional central peak is observed in a l arge temperature range, suggesting a spin fluctuation spectrum which m ay be retrieved by a more involved calculation.