Articles you may be interested inMagneto-optical Kerr effect investigation on magnetoelectric coupling in ferromagnetic/antiferroelectric multilayer thin film structures
The basic design principle of a Kerr magneto-optic apparatus with nanosecond speed (3 nsec rise time) and microscopic resolution (20 μm diam) and its application to coupled film measurements have been reported before. This paper documents the details of the apparatus construction and organization, and measurement techniques. The apparatus employs only commercially available optical and electronic components. The ultimate speed is limited by the photodetector (subnanosecond risetime) and the minimum spot size by light diffraction (less than 1 μm diam). Thus there is room for futher improvement.
While magnetization reversal in a large film sheet under uniform-field excitation is determined by the macroscopic anisotropy property and microscopic magnetization ripple structure, the magnetization reversal in miniaturized multilayer devices, in addition, depends strongly on the geometry of the device structures. Earlier papers reported the study of coupled-film strips using a nanosecond microscopic Kerr apparatus and simultaneous inductive and magneto-optic-measurement techniques. The present paper describes the reversal behavior in two coupled-film structures, in which the easy axis of each Permalloy layer may be aligned parallel to the strip length (closed hard axis or CHA) or perpendicular to the strip length (closed easy axis or CEA). The Permalloy layers may also be mismatched in thickness. When a Permalloy backing is added to the external drive line as a keeper, the reversal phenomena in both the storage layers and the keeper have been observed.
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