Magnetic Relaxation Effects in PrCo5 and Sm(x)Nd(1-x)Co5 Induced by Hydrogen and Deuterium.

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Abstract:

Measuremtns of the ac susceptibility of PrCo5 powder parallel to its c-axis show the existence of two relaxation processes which are present in samples exposed to hydrogen or deuterium but not in degassed samples. The two relaxations have time constants of 10 sec. at 165K and at 200K and are described by effective activation energies of 0.37 eV and 0.51 eV, respectively. SmxNd1-xCox crystals treated with hydrogen show a magnetic relaxation equivalent to the higher energy process in PrCo5 between -20C and 50C, a strong Barkhausen effect dominates the magnetic behavior.

Author(s):
Maartense, I.
Author Organization(s):
MANITOBA UNIV WINNIPEG DEPT OF PHYSICS
Descriptive Note:
Final rept. 3 Dec 73-30 Sep 74,
Supplementary Note:
See also report dated Oct 73, AD-775 717.
Pagination:
0036

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFML-TR-74-277, GIDEP-502.30.30.00-G7-01
Contract/Grant Number(s):
F33615-73-C-5060
Monitor Series:
TR-74-277, 502.30.30.00-G7-01
 Subject Terms
Communities of Interest:
Materials and Manufacturing Processes
Descriptor(s):
*PERMANENT MAGNETS, *COBALT ALLOYS, MAGNETIC PROPERTIES, CANADA, SINGLE CRYSTALS, IMPURITIES, HYDROGEN, DEUTERIUM, INTERMETALLIC COMPOUNDS, NEODYMIUM ALLOYS, PRASEODYMIUM COMPOUNDS, SAMARIUM COMPOUNDS
Field(s)/Group(s):
Solid State Physics
Keyword(s):
Magnetic relaxation, *Cobalt intermetallics, *Praseodymium intermetallics, *Neodymium intermetallics, *Samarium intermetallics, Barkhausen effect, Magnetic permeability
Report Date:
1975 Jan 01