Abstract
Thermomagnetic flux reversal has been studied in single-crystal layers of Y3Ga1.1Fe3.9O12 with 5-μm thickness, prepared by liquid-phase epitaxy (LPE) on a (111) Gd3Ga5O12 wafer. By structuring the layers in a checkerboard pattern of squares with 10-μm periodicity and 2-μm width and depth of the surface grooves, arbitrary stable domain patterns have been obtained. Individual squares have been switched magnetically using heat pulses from a laser beam of 20-mW intensity at 5145-Å wavelength with fields as low as 13 Oe in case of a nearly demagnetized domain distribution. The beam energy for reversing the magnetization of a square is below 1 erg.
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