Magnetization reversal in granular thin films |
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| Authors: | A. Berger |
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| Affiliation: | 1. Department of Physics, National Cheng Kung University, Tainan, 701, Taiwan;2. Research Center for Applied Sciences, Academia Sinica, Taipei, 115, Taiwan;3. Institut des NanoSciences de Paris, Université Pierre et Marie Curie, CNRS, 4 place Jussieu, 75005 Paris, France;1. Departamento de Física, Universidad Técnica Federico Santa María, Av. España 1680, Valparaiso 2390123, Chile;2. Instituto de Física, Pontificia Universidad Católica de Valparaíso, Av. Universidad 330, Curauma, Valparaíso, Chile;3. Universidad Central de Chile, Toesca 1783, Santiago 8370178, Chile;4. Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Av. Blanco Encalada 2008, Santiago, Chile;5. Instituto de Química y Bioquímica, Facultad de Ciencias, Universidad de Valparaíso, Av. Gran Bretaña 1111, Valparaíso, Chile;1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, PR China;2. University of Science and Technology of China, Hefei 230026, PR China;3. Department of Chemical Engineering, New Mexico State University, Las Cruces, NM 88003, USA;4. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, PR China;5. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, PR China |
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| Abstract: | The paper discusses the physics of magnetization reversal in granular magnetic films. It gives an overview of the key physical properties that determine the collective and macroscopically observable magnetization reversal behavior. In particular, the multitude of observable hysteresis loops is reduced to three key physical quantities, namely the single grain switching field distribution D(hs), the inter-granular exchange coupling constant Jex, and the magnetostatic interaction constant Jms. By varying the relative influence of these quantities, many different shapes of hysteresis loops can occur, which is documented by experimental examples. The regime of partially and strongly correlated reversal is discussed in detail, and minor loop measurements are presented that show scaling behavior for strongly correlated magnetization reversal in the vicinity of hysteresis loop criticality. |
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