Large uniaxial anisotropy in permalloy films
- 1 September 1966
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
- Vol. 2 (3) , 581
- https://doi.org/10.1109/tmag.1966.1065933
Abstract
Unusually large uniaxial anisotropies were observed when Permalloy films were prepared for microwave phonon generation. These films were formed on single-crystal quarts substrates. To investigate the origin of this anisotropy a number of Permalloy films having negative (92% Ni-8% Fe), near zero (83% Ni-17% Fe), and positive (70% Ni-30% Fe) magnetostriction were formed onto single-crystal quartz squares at substrate temperatures varying from room temperature to 398°C. The anisotropy increased with increasing substrate temperatures. The anisotropy constant (K) for the 92-8 and 70-30 compositions ranged from 6.0 x 103 erg/cc for room temperature films to 2.0 X 105 erg/cc for films evaporated at ~390°C. K for the 83-17 composition ranged from 4.0 X 103 erg/cc to 1.0 X 104 erg/cc for the same temperature. At first it was believed that the large anisotropy could be attributed to epitaxial growth of the Permalloy films onto the quarts. However, reflection electron diffraction showed the films to be completely randomly oriented. Furthermore, it was evident that the crystallite size in films evaporated onto glass and single-crystal quartz substrates were essentially the same for a given substrate temperature.Keywords
This publication has 1 reference indexed in Scilit:
- Microwave Photon Generation by Thin Magnetic FilmsIEEE Transactions on Ultrasonics Engineering, 1963