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Full-Text Articles in Physical Sciences and Mathematics
Dynamic Critical Curve Of A Synthetic Antiferromagnet, Huy Pham, Dorin Cimpoesu, Andrei-Valentin Plamada, Alexandru Stancu, Leonard Spinu
Dynamic Critical Curve Of A Synthetic Antiferromagnet, Huy Pham, Dorin Cimpoesu, Andrei-Valentin Plamada, Alexandru Stancu, Leonard Spinu
Physics Faculty Publications
We have investigated the effect of Fe nonstoichiometry on properties of the Fe1+y(Te,Se) superconductor system by means of resistivity, Hall coefficient, magnetic susceptibility, and specific-heat measurements. We find that the excess Fe at interstitial sites of the (Te, Se) layers not only suppresses superconductivity but also results in a weakly localized electronic state. We argue that these effects originate from the magnetic coupling between the excess Fe and the adjacent Fe square-planar sheets, which favors a short-range magnetic order.
Dynamic And Temperature Effects In Spin-Transfer Switching, Dorin Cimpoesu, Huy Pham, Leonard Spinu, Alexandru Stancu
Dynamic And Temperature Effects In Spin-Transfer Switching, Dorin Cimpoesu, Huy Pham, Leonard Spinu, Alexandru Stancu
Physics Faculty Publications
We have studied the dynamic switching triggered by spin angular momentum transfer in a pulsed current of a spin-valve-type trilayer structure, and its dependence on thermal effects. In order to determine the current pulse parameters, where fast and stable switching can be achieved, we have studied the magnetization’s dynamics properties as a function of applied current pulse amplitude and shape, waiting time, and initial orientation, and also as a function of the Gilbert damping constant. The magnetic layer is assumed to be single domain, ellipsoid shaped. In this paper also we present the thermal fluctuation effects on the switching behavior. …