Lee, WY Samad, A Moore, TA Bland, JAC Choi, BC 2024-01-21T14:05:46Z 2024-01-21T14:05:46Z 2021-09-01 2000-05-01 0021-8979 https://pubs.kist.re.kr/handle/201004/141396 We report the dynamic hysteresis behavior of epitaxial single ferromagnetic fcc NiFe(001), fcc Co(001) layers, and fcc NiFe/Cu/Co(001) spin-valve structures investigated as a function of field sweep rate in the range of 0.01-270 kOe/s using the magneto-optic Kerr effect. The hysteresis loop area A is found to follow the scaling relation A proportional to H-alpha with alpha similar to 0.13 and similar to 0.02 at low sweep rates and similar to 0.70 and similar to 0.30 at high sweep rates for 60 Angstrom NiFe and 40 Angstrom Co single magnetic layer structures, respectively. For the single and double spin valves, the "double-switching" behavior which occurs at low sweep rates transforms to "single switching" at similar to 154 and similar to 192 kOe/s, respectively. Our results provide direct experimental evidence that the magnetic anisotropy strength affects dynamic hysteresis scaling in ultrathin magnetic films. (C) 2000 American Institute of Physics. [S0021-8979(00)86708-0]. English AMER INST PHYSICS MAGNETIZATION REVERSAL DYNAMICS MOMENT DISTRIBUTION CO FILMS SI(001)/CU/FENI/CU/CO/CU/FENI/CU SYSTEMS CU(001) MODEL Dynamic hysteresis behavior in epitaxial spin-valve structures Article 10.1063/1.372783 1 JOURNAL OF APPLIED PHYSICS, v.87, no.9, pp.6600 - 6602 JOURNAL OF APPLIED PHYSICS 87 9 6600 6602 scie scopus 000086728800233 Physics, Applied Physics Article; Proceedings Paper MAGNETIZATION REVERSAL DYNAMICS MOMENT DISTRIBUTION CO FILMS SI(001)/CU/FENI/CU/CO/CU/FENI/CU SYSTEMS CU(001) MODEL dynamic hysteresis epitaxial thin films spin-valve structures