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Title: Delayed demagnetization jumps in (NdDy)(FeCo)B magnets in a steady-state magnetic field

Abstract

Spontaneous demagnetization jumps are observed in sintered magnets (Nd{sub 0.6}Dy{sub 0.4}){sub 16}(Fe{sub 0.77}Co{sub 0.23}){sub 78}B{sub 6} in a constant magnetic field after a sharp decrease in an external magnetic field from the value corresponding to the saturation to a value close to the coercive force. It is shown that the number of the magnetization jumps is proportional to their amplitudes. A low value of the autocorrelation coefficient between the jump amplitude and the time of its appearance (R < 0.1) demonstrate the stochasticity of the jumps. It is found that the spectral jump density is independent of the frequency, i.e., a white magnetic noise is observed. The distribution of the magnetic field gradient has been obtained near the sample surface that makes it possible to distinguish domains and the grain magnetization in the dependence on the direction of the texturing of the sintered magnet.

Authors:
; ;  [1]; ; ;  [2];  [1]
  1. Russian Academy of Sciences, Institute of Problems of Chemical Physics (Russian Federation)
  2. All-Russia Scientific Research Institute of Aviation Materials VIAM (Russian Federation)
Publication Date:
OSTI Identifier:
22771522
Resource Type:
Journal Article
Journal Name:
Physics of the Solid State
Additional Journal Information:
Journal Volume: 59; Journal Issue: 11; Other Information: Copyright (c) 2017 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7834
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AMPLITUDES; COBALT COMPOUNDS; COERCIVE FORCE; CORRELATIONS; DEMAGNETIZATION; DENSITY; DISTRIBUTION; DYSPROSIUM COMPOUNDS; IRON COMPOUNDS; MAGNETIC FIELDS; MAGNETIZATION; MAGNETS; NEODYMIUM COMPOUNDS; NOISE; QUATERNARY ALLOY SYSTEMS; SATURATION; STEADY-STATE CONDITIONS; SURFACES

Citation Formats

L’vova, G. L., Kirman, M. V., Koplak, O. V., Kucheryaev, V. V., Valeev, R. A., Piskorskii, V. P., and Morgunov, R. B., E-mail: morgunov2005@yandex.ru. Delayed demagnetization jumps in (NdDy)(FeCo)B magnets in a steady-state magnetic field. United States: N. p., 2017. Web. doi:10.1134/S1063783417110208.
L’vova, G. L., Kirman, M. V., Koplak, O. V., Kucheryaev, V. V., Valeev, R. A., Piskorskii, V. P., & Morgunov, R. B., E-mail: morgunov2005@yandex.ru. Delayed demagnetization jumps in (NdDy)(FeCo)B magnets in a steady-state magnetic field. United States. doi:10.1134/S1063783417110208.
L’vova, G. L., Kirman, M. V., Koplak, O. V., Kucheryaev, V. V., Valeev, R. A., Piskorskii, V. P., and Morgunov, R. B., E-mail: morgunov2005@yandex.ru. Wed . "Delayed demagnetization jumps in (NdDy)(FeCo)B magnets in a steady-state magnetic field". United States. doi:10.1134/S1063783417110208.
@article{osti_22771522,
title = {Delayed demagnetization jumps in (NdDy)(FeCo)B magnets in a steady-state magnetic field},
author = {L’vova, G. L. and Kirman, M. V. and Koplak, O. V. and Kucheryaev, V. V. and Valeev, R. A. and Piskorskii, V. P. and Morgunov, R. B., E-mail: morgunov2005@yandex.ru},
abstractNote = {Spontaneous demagnetization jumps are observed in sintered magnets (Nd{sub 0.6}Dy{sub 0.4}){sub 16}(Fe{sub 0.77}Co{sub 0.23}){sub 78}B{sub 6} in a constant magnetic field after a sharp decrease in an external magnetic field from the value corresponding to the saturation to a value close to the coercive force. It is shown that the number of the magnetization jumps is proportional to their amplitudes. A low value of the autocorrelation coefficient between the jump amplitude and the time of its appearance (R < 0.1) demonstrate the stochasticity of the jumps. It is found that the spectral jump density is independent of the frequency, i.e., a white magnetic noise is observed. The distribution of the magnetic field gradient has been obtained near the sample surface that makes it possible to distinguish domains and the grain magnetization in the dependence on the direction of the texturing of the sintered magnet.},
doi = {10.1134/S1063783417110208},
journal = {Physics of the Solid State},
issn = {1063-7834},
number = 11,
volume = 59,
place = {United States},
year = {2017},
month = {11}
}