Anomalous magnetic viscosity in α-Fe(Co)/(Nd,Pr)2Fe14B exchange-spring magnet

N.H.Nguyen Hoang Hai; Nguyen Chau; Duc-The Ngo; D.T.H.Duong Thi Hong Gam

doi:10.1016/j.jmmm.2011.07.002

Anomalous magnetic viscosity in α-Fe(Co)/(Nd,Pr)₂Fe₁₄B exchange-spring magnet

N.H.Nguyen Hoang Hai
, Nguyen Chau
, Duc-The Ngo
, D.T.H.Duong Thi Hong Gam

Hanoi University of Science and Technology
Toyota Technological Institute
The Academy of Cryptography Techniques

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

This article presents an anomalous magnetic viscosity in α-Fe(Co)/(Nd,Pr)₂Fe₁₄B exchange-spring magnet. A similar effect has been observed in non-interacting or weakly interacting systems but not in a strong interacting magnetic systems. We reported a new procedure to measure magnetic relaxation under various magnetic fields. Changing the applied magnetic field by different field protocols during the reversal process, we found that a memory effect of the magnetization appeared if the field change is large enough. The mechanism of the phenomenon can be explained in the model of conventional magnetic reversal in strong ferromagnetic systems with an energy barrier distribution. The study of such magnetic relaxations can provide some information related to the energy barrier distribution function.

Original language	English
Journal	Journal of Magnetism and Magnetic Materials
Volume	323
Issue number	23
Pages (from-to)	3156-3161
ISSN	0304-8853
DOIs	https://doi.org/10.1016/j.jmmm.2011.07.002
Publication status	Published - 2011
Externally published	Yes

Keywords

Magnetic relaxation
Exchange spring magnet
Hard magnetic material
Magnetic viscosity
Magnetic reversal

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10.1016/j.jmmm.2011.07.002

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Cite this

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title = "Anomalous magnetic viscosity in α-Fe(Co)/(Nd,Pr)2Fe14B exchange-spring magnet",

abstract = "This article presents an anomalous magnetic viscosity in α-Fe(Co)/(Nd,Pr)2Fe14B exchange-spring magnet. A similar effect has been observed in non-interacting or weakly interacting systems but not in a strong interacting magnetic systems. We reported a new procedure to measure magnetic relaxation under various magnetic fields. Changing the applied magnetic field by different field protocols during the reversal process, we found that a memory effect of the magnetization appeared if the field change is large enough. The mechanism of the phenomenon can be explained in the model of conventional magnetic reversal in strong ferromagnetic systems with an energy barrier distribution. The study of such magnetic relaxations can provide some information related to the energy barrier distribution function.",

keywords = "Magnetic relaxation, Exchange spring magnet, Hard magnetic material, Magnetic viscosity, Magnetic reversal",

author = "Hai, \{N.H.Nguyen Hoang\} and Nguyen Chau and Duc-The Ngo and Gam, \{D.T.H.Duong Thi Hong\}",

year = "2011",

doi = "10.1016/j.jmmm.2011.07.002",

language = "English",

volume = "323",

pages = "3156--3161",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

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TY - JOUR

T1 - Anomalous magnetic viscosity in α-Fe(Co)/(Nd,Pr)2Fe14B exchange-spring magnet

AU - Hai, N.H.Nguyen Hoang

AU - Chau, Nguyen

AU - Ngo, Duc-The

AU - Gam, D.T.H.Duong Thi Hong

PY - 2011

Y1 - 2011

N2 - This article presents an anomalous magnetic viscosity in α-Fe(Co)/(Nd,Pr)2Fe14B exchange-spring magnet. A similar effect has been observed in non-interacting or weakly interacting systems but not in a strong interacting magnetic systems. We reported a new procedure to measure magnetic relaxation under various magnetic fields. Changing the applied magnetic field by different field protocols during the reversal process, we found that a memory effect of the magnetization appeared if the field change is large enough. The mechanism of the phenomenon can be explained in the model of conventional magnetic reversal in strong ferromagnetic systems with an energy barrier distribution. The study of such magnetic relaxations can provide some information related to the energy barrier distribution function.

AB - This article presents an anomalous magnetic viscosity in α-Fe(Co)/(Nd,Pr)2Fe14B exchange-spring magnet. A similar effect has been observed in non-interacting or weakly interacting systems but not in a strong interacting magnetic systems. We reported a new procedure to measure magnetic relaxation under various magnetic fields. Changing the applied magnetic field by different field protocols during the reversal process, we found that a memory effect of the magnetization appeared if the field change is large enough. The mechanism of the phenomenon can be explained in the model of conventional magnetic reversal in strong ferromagnetic systems with an energy barrier distribution. The study of such magnetic relaxations can provide some information related to the energy barrier distribution function.

KW - Magnetic relaxation

KW - Exchange spring magnet

KW - Hard magnetic material

KW - Magnetic viscosity

KW - Magnetic reversal

U2 - 10.1016/j.jmmm.2011.07.002

DO - 10.1016/j.jmmm.2011.07.002

M3 - Journal article

SN - 0304-8853

VL - 323

SP - 3156

EP - 3161

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 23

ER -