Magnetization and Uniaxial Anisotropy Measurements for He+ and H2 + Implanted Garnet Filmus

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Abstract
Magnetization measurements using a vibrating-sample-magnetometer for helium and hydrogen implanted garnet films were carried out up to the Curie temperature. Using these data, the uniaxial anisotropy was also deduced by FMR. The magnetization and absolute value of the uniaxial anisotropy for helium-implanted films decrease more markedly at high temperatures, compared with the values for hydrogen-implanted films. It is shown from the normalized magnetization values that the defects created by hydrogen implantations might be smaller than those created by helium implantations. The differences in the bubble operation limits at high temperatures between helium and hydrogen implantations can be attributed to these different magnetic properties for helium- and hydrogen-implanted films.