Magnetic viscosity in NdFeB and SmCo5 alloys |
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| Affiliation: | 1. Department of Physics, The University of Western Australia, Nedlands, Western Australia 6009, Australia;1. École Polytechnique, Palaiseau, France;2. Budker Institute of Nuclear Physics and Novosibirsk State University, 630 090, Novosibirsk, Russia;1. Research Center for Solid State Physics and Materials, School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China;2. Department of Chemistry, Moscow State University, Leninskie Gory, House 1, Building 3, GSP-2, Moscow 119992, Russia;1. College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China;2. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;3. Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, China;4. Shenzhen Engineering Laboratory for Advanced Technology of Ceramics, Shenzhen 518060, China;1. School of Physics, Peking University, Beijing 100871, China;2. Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China;1. Department of Physics, College of Science, King Faisal University, P.O Box 400, Hofuf, Al-Ahsa, 31982, Saudi Arabia;2. Department of Physics, University of Petroleum & Energy Studies, Dehradun, 248007, India;3. School of Material Science and Engineering, Changwon National University, Changwon, Gyeongnam, 51140, Republic of Korea;4. Department of Physics, Banasthali Vidyapith, Banasthali- 304022, Rajasthan, India;5. Department of Pure & Applied Physics, University of Kota, Kota, 324005, Rajasthan, India |
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| Abstract: | The magnetic viscosity parameters (kT/q=Sv) of spherical specimens of NdFeB and SmCo5 have been measured as functions of intensity of magnetization. Two methods of measurement were used for both specimens. For the NdFeB specimen the value of kT/q varies from 50 Oe at M=+400 G to 80 Oe at M=-900 G. For SmCo5, kT/q varies from approximately 18 to 21 Oe and has a maximum value at M=0. For each specimen the two methods of measurement give results which are in agreement within the limits of experimental error. The volumes of material which are subject to thermal activation, e.g. pinning or nucleation centres, range from 4 to 6.4X10-19 cm3 for NdFeB and is about 2.4X10-18 cm3 for SmCo5. |
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