SPIN WAVE INSTABILITIES AND RELAXATION IN SINGLE CRYSTAL PERMALLOY.

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Abstract:

The principal conclusion is that there exists in single crystals of 81-19 Ni-Fe alloy a temperature independent and k independent relaxation mechanism or combination of mechanisms which results in an X band spin wave linewidth delta H sub k of 75 Oe plus or minus 15 Oe. This corresponds to an energy relaxation time of 7.15 x 10 to the -10th power sec. for spin waves at 8.4 GHz. The fact that this PPI result is not dominated by inhomogeneous broadening has been demonstrated by achieving the same result from two samples of very different surface finish which had very different FMR resonance lines. Author

Author(s):
Milton, Albert Fenner
Author Organization(s):
HARVARD UNIV CAMBRIDGE MASS DIV OF ENGINEERING AND APPLIED PHYSICS
Descriptive Note:
Technical rept.,
Pagination:
0187

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-573
Contract/Grant Number(s):
N00014-67-A-0298
Project Number(s):
NR-372-012
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*MAGNETIC RESONANCE, RELAXATION TIME), (*MAGNETIC MOMENTS, INTERACTIONS), BAND THEORY OF SOLIDS, NICKEL ALLOYS, IRON ALLOYS, SINGLE CRYSTALS, X BAND, CRYOGENICS, STABILITY, THESES
Field(s)/Group(s):
Electricity and Magnetism, Solid State Physics
Keyword(s):
EXCHANGE INTERACTIONS, MAGNETIC SUSCEPTABILITY, MAGNONS, PERMALLOYS, SPIN WAVES
Report Date:
1968 Sep 01