Magnetization reversal of a single cobalt cluster using a RF field pulse |
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| Authors: | A Tamion C Raufast E Bonet V Dupuis T Fournier T Crozes E Bernstein W Wernsdorfer |
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| Institution: | 1. Laboratoire de Physique de la Matière Condensée et Nanostructures, Université de Lyon 1, 69622 Villeurbanne, France;2. Institut Néel, CNRS, 25 Avenue Des Martyrs BP 166, 38042 Grenoble, France;1. Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Aarhus C, Denmark;2. Theoretical Molecular Science Laboratory and iTHES, RIKEN, Hirosawa 2-1, Saitama 351-0198, Japan;1. Naval Research Laboratory, 1009 Balch Blvd, Stennis Space Center, MS 39529, United States;2. Naval Research Laboratory, 7 Grace Hopper Ave. Stop 2, Monterey, CA 93943, United States;3. QinetiQ North America, 1009 Balch Blvd, Stennis Space Center, MS 39529, United States;4. Naval Oceanographic Office, 1101 Balch Blvd, Stennis Space Center, MS 39529, United States;1. Centro de Física Atómica da Universidade de Lisboa, Av. Prof. Gama Pinto 2, 1649-003 Lisboa, Portugal;2. IST/ITN, Instituto Superior Técnico, Universidade Técnica de Lisboa, Campus Tecnológico e Nuclear, EN10, 2686-953 Sacavém, Portugal;3. Dept. Física da Fac. Ciências da Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016 Lisboa, Portugal;1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China;2. School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China |
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| Abstract: | Technological improvements require the understanding of dynamical magnetization reversal processes at the nanosecond time scales. In this paper, we present the first magnetization reversal measurements performed on a single cobalt cluster (counting only a thousand of spins), using the micro-superconducting quantum interference device (SQUID) technique by applying a constant magnetic field combined with a radio-frequency (RF) field pulse. First of all, we present the different technical steps necessary to detect the magnetic reversals at low temperature (T=35 mK) of a well-defined nanoparticle prepared by low energy clusters beam deposition (LECBD). We previously showed that the three-dimensional (3D)-switching Stoner-Wohlfarth astroid represents the magnetic anisotropy of the nanoparticle. Then, an improved device coupled with a gold stripe line, allow us to reverse such macrospin, using a RF pulse. A qualitative understanding of the magnetization reversal by non-linear resonance has been obtained with the Landau-Lifschitz-Gilbert (LLG) equation. |
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