Investigation of magnetization creep of Co5Sm samples

Author

Stieler, S. ; Heiden, C. ; Kuntze, K. ; Kohake, D.

Author_Institution

Justus-Liebeg-Universität Giessen, Gießen

Volume

20

Issue

5

fYear

1984

fDate

9/1/1984 12:00:00 AM

Firstpage

1581

Lastpage

1583

Abstract

The magnetization creep and the thermal aftereffect of sintered Co5Sm samples were measured in the neighborhood of the remanent state. The temperature dependence of the thermal aftereffect constant Svand the field excursion dependence of Svand of the creep effect were investigated. With a high speed, low drift SQUID-system and the aid of a precision temperature controller, magnetization changes of the order of 10^-6of the remanent magnetization Mrcould be measured. The creep effect was found to follow a $\\Delta M_{n} \\sim \\sqrt {\\ln n}$ law for $5 \\leq n \\leq 100$ , where n is the number of minor hysteresis cycles. Starting from the sheared remament state however, for field amplitudes up to 100 A/cm, a creep effect could not be detected, i.e. $\\Delta M_{n}$ is smaller than 10^-6, Mr. For the investigated specimens the thermal aftereffect constant Svin the interval 220K - 300K was found to decrease with increasing temperature.

Keywords

Component reliability; Permanent magnet motors; Creep; Magnetic field measurement; Magnetization; Magnets; Microprocessors; Nitrogen; Pulse measurements; SQUIDs; Temperature control; Time measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1984.1063185

Filename

1063185