Magnetization reorientation in Ni (1 1 1) ultrathin films studied by low-temperature hysteresis measurements |
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| Institution: | 1. Full Professor in Anesthesiology of the Department of Medicine of the University of Udine. Udine, Italy. P. le S.M. Misericordia, 15 - 33100 Udine, Italy;2. Resident in Anesthesia and Intensive Care Medicine of the “Sapienza University of Rome”. Rome, Italy. P. le Aldo Moro, 5. 00185 Rome, Italy;1. CNRS UMR 5536 RMSB-University of Bordeaux, Bordeaux, France;2. CNRS UMR 5164, ImmunoConcEpT, University of Bordeaux, France;3. Department of Basic Sciences, Loma Linda University School of Medicine, Loma Linda, CA, USA |
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| Abstract: | Surface magneto-optical Kerr effect (SMOKE) magnetometry in the temperature range 10–300 K was exploited to investigate the magnetic properties of high-quality Cu/Ni/Cu/Si(1 1 1) epitaxial heterostructures with thickness of the Ni layer, dNi, between 10 and 60 Å. For a fixed temperature, the equilibrium direction of the magnetization is parallel or perpendicular to the film surface, depending on the Ni thickness, because of the competition among shape anisotropy, magnetoelastic anisotropy and interface anisotropy. No reorientation of the magnetization could be observed as a function of temperature, for any of the specimens analyzed, while a large variation of the loop squareness and coercivity was found. This last variation has been qualitatively explained using a theoretical model based on a Green's function technique, valid for a monodomain film with a coherent rotation of the magnetization. |
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