Accession Number : AD0758218

Title :   An Investigation of the AC Susceptibility of Some RCo5 Compounds.

Descriptive Note : Final rept. 1 Feb 72-31 Jul 72,

Corporate Author : MANITOBA UNIV WINNIPEG DEPT OF PHYSICS

Personal Author(s) : Maartense,I. ; Searle,C. W.

Report Date : NOV 1972

Pagination or Media Count : 30

Abstract : The ac susceptibilities of powdered samples of SmCo5, YCo5, and NdCo5 have been measured at frequencies between 1.5 and 75 kHz and at temperatures between 4.2 and 300K. No definite frequency dependence was noted. Except near the spin reorientation temperatures of NdCo5 and PrCr5, the susceptibility is very low, indicating extensive pinning of domain walls. Near 150K, NdCo5 shows an unusual dependence on the cooling rate. Field sweeps of the order of plus or minus 100 Oe show time and field dependences including disaccommodation, a sweep rate dependence and a field turnaround anomaly. These observations are discussed on the basis of a tentative model of domain wall pinning. (Author)

Descriptors :   (*COBALT ALLOYS, MAGNETIC PROPERTIES), (*RARE EARTH COMPOUNDS, MAGNETIC PROPERTIES), INTERMETALLIC COMPOUNDS, MAGNETIC MATERIALS, SAMARIUM, YTTERBIUM, PRASEODYMIUM, NIOBIUM ALLOYS, ALTERNATING CURRENT, CANADA

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE