Angular dependence of the coercive force of textured rare earth permanent magnets |
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| Institution: | 1. Department of Applied Chemistry, Hiroshima University, Higashi-hiroshima, Hiroshima, 739-8527, Hiroshima, Japan;2. Dpto. Física de Materiales, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, Madrid, 28040, Spain;3. Dipartimento di Fisica, Università di Ferrara, Via Saragat 1, 44122, Ferrara, Italy;4. BM25-Spline, The Spanish CRG at the ESRF, 38000 Grenoble, France;5. Instituto de Ciencia de Materiales de Madrid-CSIC, 28049 Madrid, Spain;6. CNISM and Dipartimento di Fisica, Università di Ferrara, Via Saragat 1, 44122, Ferrara, Italy;1. Dept. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain;2. Instituto de Sistemas Optoelectrónicos y Microtecnología. Universidad Politécnica de Madrid, 28040 Madrid, Spain;1. The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego Str. 152, 31-342 Krakow, Poland;2. Research Institute for Nuclear Problems of Belarusian State University, Bobruiskaya Str. 11, 220030 Minsk, Belarus;1. Department of Chemistry – Ångström Laboratory, Uppsala University, Box 538, 751 21 Uppsala, Sweden;2. Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden;3. MAX IV Laboratory, Lund University, Box 118, 221 00 Lund, Sweden;1. Graduate School of Science and Engineering, Kagoshima University, 890-005 Kagoshima, Japan;2. Institute for Materials Research, Tohoku University, 980-8577 Sendai, Japan;3. High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, 980-8577 Sendai, Japan |
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| Abstract: | On the basis of model calculations experimental results on the angular dependence of the coercivity Hc and the remanence coercivity HR of hard magnetic materials of the type SmCo5, Sm2(Co, Fe, Cu, Zr)15 and Nd2Fe14B are discussed. In the model coherent rotation as well as incoherent magnetization jumps (e.g. 180°-Bloch walls) are included. The texture is described by an axial symmetric distribution of the easy axes with only oneparameter. For Sm2(Co, Fe, Cu, Zr)15 the model explains irreversible (HR (θ)-curves) as well as reversible (HR(θ)−Hc(θ)) magnetization processesin good agreement with the experiments, whereas stronger deviations exist for SmCo5 and Nd2Fe14B, especially in the Hc(θ)-curves. These deviations should be caused by other reversible magnetization processes |
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