The effect of substrate misorientation on the magnetic properties; of epitaxial garnet films

We describe a nonvisual apparatus for directly measuring the collapse field of any bubble-domain material regardless of bubble diameter. We employ an optical technique utilizing the Faraday effect. Laser light is passed through the sample and polarizer and is then directed onto a photodetector. The bias field applied to the sample includes an ac component which modulates the bubble diameter and hence causes an ac output from the photodetector. The collapse field is determined by increasing the dc component of the bias field until the ac photodetector output due to the bubble modulation drops to zero. Although this method is straightforward in principle, a number of special measures are necessary to make rapid and accurate measurements. We discuss how the optimum optical wavelength and power for these measurements are determined by the magneto-optic and absorption characteristics of bubble garnets. We also describe the means to achieve the essential requirement of low laser noise. Finally, we present typical results obtained with our technique on a garnet material having 1.4 μm stripes. These data demonstrate that accuracies of ∼1% are readily achieved with measurement times of less than one minute.

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Angular dependence of site preference in growth-induced anisotropy

Josephs¹,

Stein²,

Callen

et al. 1980

Journal of Applied Physics

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We have investigated the dependence of the growth-induced anisotropy on the orientation of the crystalline growth face in a series of (YLaEu)3 (FeGa)5 0 12 films epitaxially grown so that the growth face normal deviates from the [111] direction in a (110) plane by angles varying from 0° to 14.6°. We have determined the direction of the respective net easy axis tilt angles and have found them all to lie in the (110) tilt planes at angles ranging up to _60°. We have also measured the azimuthal dependence of the ferromagnetic resonance field in the film plane for the various samples. The tilt angle data were analyzed using an expansion for the growth induced anisotropy carried to fourth order in (3, the direction of the growth face normal. The results of this analysis were used to compute the angular variation of the ferromagnetic resonance field; the results are qualitatively correct in shape although deviating quantitatively by -20%. In contrast, the conventional fit to second order in (3 is qualitatively incorrect.

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The effect of substrate misorientation on the magnetic properties; of epitaxial garnet films

Cited by 4 publications

References 3 publications

Remanent domain structures in magnetic garnet epilayers after planar saturation

Remanent domain structures in magnetic garnet epilayers after planar saturation

Nonvisual measurement of collapse field in small-bubble garnets

Angular dependence of site preference in growth-induced anisotropy

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