Annealing Behavior of Induced Anisotropy and Related Magnetic Properties in Permalloy Films
- 1 April 1969
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 40 (5), 2258-2266
- https://doi.org/10.1063/1.1657968
Abstract
Anisotropy aging and stabilization effects have been investigated in vapor‐deposited zero‐magnetostrictive Permalloy films by annealing either in a rotating magnetic field or in an easy direction field. Two major components in the anisotropy relaxation were observed. Amounts of the two components are comparable in fresh films. By stabilization annealing at 300°C for 35 h, the fraction of the anisotropy affected by the faster component can be made less than of the total initial anisotropy, during which time the relaxation frequency of the slower component gradually decreases from about 10−4 sec−1 to about 10−6 sec−1. The fast component is suggested to be related to high‐diffusivity paths in films while reorientation of the ordered atomic pairs as a result of the bulk diffusion process can account for the slow component. However, the vacancy concentration is found to be far in excess of the thermal equilibrium value in fresh films, leading to marked increases in the initial diffusion rates compared with bulk Permalloy values. It is found that the vacancy rate‐of‐change process follows the chemical rate equation of order 2, which suggests the formation of divacancies. The change‐of‐slope method is introduced for determination of the activation energy for atomic movement involved in the reorientation process of atom pairs, giving a value of 1.6 eV which is in reasonable agreement with estimates of this quantity from bulk data.
Keywords
This publication has 15 references indexed in Scilit:
- Electrodeposited filmsIEEE Transactions on Magnetics, 1968
- Induced anisotropy in Ni-Fe filmsIEEE Transactions on Magnetics, 1968
- Excitation of Uniaxial-Anisotropy Relaxation Processes in Magnetic Films by a Rotating Magnetic AnnealJournal of Applied Physics, 1968
- Kinetics of Annealing of Permalloy Films with Increasing Concentrations of SulfurJournal of Applied Physics, 1968
- Rotating Field Magnetometer for Measurement of Anisotropic Magnetic MaterialsReview of Scientific Instruments, 1967
- Magnetic Properties and Annealing Behavior of Electrodeposited NiFeS Thin FilmsJournal of Applied Physics, 1967
- Magnetic anneal and ordering in Fe-Ni alloys enhanced by excess of vacanciesIEEE Transactions on Magnetics, 1966
- Measured Relaxation Times for the Uniaxial-Anisotropy Spectrum in Nonmagnetostrictive Permalloy FilmsJournal of Applied Physics, 1966
- On the Origin of M‐Induced Anisotropy in Nickel and Permalloy FilmsPhysica Status Solidi (b), 1966
- Anisotropie magnétique superficielle et surstructures d'orientationJournal de Physique et le Radium, 1954