Critical Fields Determining Magnetic Coercivity in Microparticles of SmCo5 and LaCo5
- 15 March 1971
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 42 (4) , 1510-1515
- https://doi.org/10.1063/1.1660321
Abstract
Magnetic hysteresis curves measured by a specially designed magnetometer on a single particle taken from a ground SmCo5 powder show that the coercivity is determined by pinning of domain walls. Heat treatment at 100°C in air reduces the pinning force. Magnetizing the particle in a strong field increases the pinning force. A wall‐pinning model is proposed to explain this effect. The coercivity of a particle taken from the powder after electrolytic etching seems to be determined by nucleation of domain walls. Heat treatment at 100°C in air does not significantly influence the field at which nucleation occurs. The coercivity of an LaCo5 particle is determined by pinning. The pinning force is reduced by hydrogen absorption.This publication has 6 references indexed in Scilit:
- Domain-Wall Processes in SmCo5 PowdersJournal of Applied Physics, 1970
- A Vibrating Reed Magnetometer for Microscopic ParticlesReview of Scientific Instruments, 1970
- Coercivity and wall motionIEEE Transactions on Magnetics, 1970
- Influence of hydrogen on the magnetic properties of SmCo5Solid State Communications, 1969
- A Domain-Boundary Model for a High Coercive Force MaterialJournal of Applied Physics, 1968
- Evidence by Lorentz Microscopy for Magnetically Active Stacking Faults in MnAl AlloyJournal of Applied Physics, 1966