Model for domain wall avalanches in ferromagnetic thin films |
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| Authors: | RC Buceta D Muraca |
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| Institution: | 1. Grupo de F?´sica Mesoscópica, Departamento de F?´sica, Universidad Nacional de Colombia, Bogotá, Colombia;2. UNESP-Universidade Estadual Paulista, Departamento de F?´sica, Caixa Postal 473, Bauru-SP, Brazil;3. UNESP-Universidade Estadual Paulista, IPMet-Instituto de Pesquisas Meteorológicas, CEP 17048-699 Bauru, SP, Brazil;4. Departamento de F?´sica, Universidade Federal de Pernambuco, 50670-901 Recife-PE, Brazil;5. Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium;6. Departamento de F?´sica, Universidade Federal do Ceará, Fortaleza, Ceará 60455-760, Brazil;1. Scientific-Practical Materials Research Centre NAS of Belarus, 19 P. Brovki Street, Minsk 220072, Belarus;2. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow 119991, Russia;3. Laboratory of Magnetism, Faculty of Physics, University of Bialystok, Giolkowskiego 1L, Bialystok 15-240, Poland;1. Bioengineering Department, University of Texas Southwestern Medical Center and The University of Texas at Arlington, Arlington, TX 76019, USA;2. Radiology, Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA;3. Internal Medicine, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390, USA;4. Texas Health Physicians Group, Texas Health Arlington Memorial Hospital, Arlington, TX 76012, USA;1. Department of Mechanical Engineering, Motilal Nehru National Institute of Technology, Prayagraj 211004, India;2. Department of Mechanical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India;1. Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic;2. Faculty of Mechanical Engineering, University of ?ilina, Univerzitná 1, 01026 ?ilina, Slovakia |
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| Abstract: | The Barkhausen jumps or avalanches in magnetic domain-walls motion between successive pinned configurations, due the competition among magnetic external driving force and substrum quenched disorder, appear in bulk materials and thin films. We introduce a model based in rules for the domain wall evolution of ferromagnetic media with exchange or short-range interactions, that include disorder and driving force effects. We simulate in 2-dimensions with Monte Carlo dynamics, calculate numerically distributions of sizes and durations of the jumps and find power-law critical behavior. The avalanche-size exponent is in excellent agreement with experimental results for thin films and is close to predictions of the other models, such as like random-field and random-bond disorder, or functional renormalization group. The model allows us to review current issues in the study of avalanches motion of the magnetic domain walls in thin films with ferromagnetic interactions and opens a new approach to describe these materials with dipolar or long-range interactions. |
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