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Abstract: Comparison of magnetic and crystalline profiles in He+-implanted Gd,Tm,Ga:YIG

Speriosu, V. S. and Wilts, C. H. (1982) Abstract: Comparison of magnetic and crystalline profiles in He+-implanted Gd,Tm,Ga:YIG. Journal of Applied Physics, 53 (3). p. 2516. ISSN 0021-8979. https://resolver.caltech.edu/CaltechAUTHORS:SPEjap82

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Abstract

Profiles of magnetic and crystalline properties in He+-implanted <111>-oriented Gd,Tm,Ga:YIG were obtained using ferromagnetic resonance and x-ray diffraction techniques, respectively. Implantation was done at room temperature several degrees off <111> axis. One series of samples was implanted with 140 keV He+ at 1.5, 3.0, 4.5, and 6.0×10^15 at. cm^−2. Another series consisted of three profiles obtained with single, double, and triple energies and doses in the range 30–140 keV and 9.0×10^14–3.0×10^15 at. cm^−2. For the highest dose the maximum changes in magnetic properties were: −3200 Oe in uniaxial anistropy Hk, a 55% decrease in magnetization M, a 65% decrease in exchange constant A, a 20% increase in damping parameter alpha, and no change in gyromagnetic ratio gamma. The maximum perpendicular strain epsilon[perpendicular] was 1.26% with a corresponding maximum rms random atomic displacement of 0.23 Å. Lateral strain epsilon|| was zero. No evidence was found for creation of extended defects. The highest dose was, at most, half of that required to produce amorphousness. Both DeltaHk and epsilon[perpendicular] had a significantly sublinear dependence on dose. The ratio of maximum DeltaHk for the 6.0 and 1.5×10^15 at. cm^−2 was 1.8 instead of 4.0. The corresponding ratio for strain was 2.6. The difference in sublinearity indicates that DeltaHk and epsilon[perpendicular] are not linearly related through magnetostriction. The equation relating DeltaHk, M, and epsilon[perpendicular] can be preserved only by invoking implantation-induced changes in Young's modulus, Poisson's ratio, or the magnetostriction.


Item Type:Article
Additional Information:Copyright © 1982 American Institute of Physics.
Subject Keywords:CRYSTAL STRUCTURE, MAGNETIC PROPERTIES, X−, RAY DIFFRACTION ANALYSIS, FERROMAGNETIC RESONANCE, ION IMPLANTATION, MAGNETIZATION, KEV RANGE, STRAINS, FERRITE GARNETS, DAMPING, GYROMAGNETIC RATIO, GALLIUM, THULIUM, GADOLINIUM, HELIUM IONS, FILMS
Issue or Number:3
Record Number:CaltechAUTHORS:SPEjap82
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:SPEjap82
Alternative URL:http://dx.doi.org/10.1063/1.330855
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10204
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:16 Apr 2008
Last Modified:03 Oct 2019 00:07

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