Computer simulation of magnetic properties of nanocomposite magnets

被引:23
作者
Fukunaga, H
Kitajima, N
Kanai, Y
机构
[1] Department of Electrical Engineering and Computer Science, Faculty of Engineering, Nagasaki University
来源
MATERIALS TRANSACTIONS JIM | 1996年 / 37卷 / 04期
关键词
nanocomposite magnet; spring magnet; exchange interaction; magnetostatic interaction; remanence enhancement; coercivity; energy product; remanence; soft phase; hard phase; computer simulation;
D O I
10.2320/matertrans1989.37.864
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Magnetic properties of a model nanocomposite magnet, which is composed of magnetically soft and hard grains, were calculated by means of computer simulation, and the effects of the strength of intergrain exchange interaction and the amount of soft grains on them were studied. The presence of soft grains and the intergrain exchange coupling enhanced the remanence remarkably, and the remanence over 0.8M(S) was obtained in the model magnets containing more than 25% soft grains in volume. The calculated coercivity vs. the strength of the exchange interaction curves showed a peak at a critical strength of the exchange interaction, although the remanence increased monotonically with increase in the strength of the exchange interaction. Thus the maximum energy product also reached a peak around the same critical strength. The calculated maximum energy product exceeded 300 kJ/m(3) for the magnet composed of Fe3B and Nd2Fe14B and 400 kJ/m(3) for one composed of alpha-Fe and Nd2Fe14B. Dispersion of the strength of the exchange coupling reduced the energy product significantly, which suggests that homogeneous microstructure is needed to obtain nanocomposite magnets with superior magnetic properties.
引用
收藏
页码:864 / 869
页数:6
相关论文
共 15 条
  • [1] NOVEL PERMANENT MAGNETIC-MATERIALS MADE BY RAPID QUENCHING
    COEHOORN, R
    DEMOOIJ, DB
    DUCHATEAU, JPWB
    BUSCHOW, KHJ
    [J]. JOURNAL DE PHYSIQUE, 1988, 49 (C-8): : 669 - 670
  • [2] HIGH MAGNETIC PERFORMANCE IN ISOTROPIC ALPHA-FE+SM2FE17NX
    DING, J
    LIU, Y
    STREET, R
    MCCORMICK, PG
    [J]. JOURNAL OF APPLIED PHYSICS, 1994, 75 (02) : 1032 - 1035
  • [3] EFFECT OF INTERGRAIN EXCHANGE INTERACTION ON MAGNETIC-PROPERTIES IN ISOTROPIC ND-FE-B MAGNETS
    FUKUNAGA, H
    INOUE, H
    [J]. JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 1992, 31 (5A): : 1347 - 1352
  • [4] FUKUNAGA H, 1995, P 2 JAP CZECH SLOV J, P169
  • [5] GILBERT TL, 1955, PHYS REV, V100, P1243
  • [6] GRAIN-SIZE DEPENDENCE OF COERCIVITY AND PERMEABILITY IN NANOCRYSTALLINE FERROMAGNETS
    HERZER, G
    [J]. IEEE TRANSACTIONS ON MAGNETICS, 1990, 26 (05) : 1397 - 1402
  • [7] HIGH-COERCIVITY IRON-RICH RARE-EARTH PERMANENT-MAGNET MATERIAL BASED ON (FE, CO)3B-ND-M (M=AL, SI, CU, GA, AG, AU)
    HIROSAWA, S
    KANEKIYO, H
    UEHARA, M
    [J]. JOURNAL OF APPLIED PHYSICS, 1993, 73 (10) : 6488 - 6490
  • [8] THE EXCHANGE-SPRING MAGNET - A NEW MATERIAL PRINCIPLE FOR PERMANENT-MAGNETS
    KNELLER, EF
    HAWIG, R
    [J]. IEEE TRANSACTIONS ON MAGNETICS, 1991, 27 (04) : 3588 - 3600
  • [9] COERCIVITY OF SM-FE-N FERROMAGNETS PRODUCED BY THE MECHANICAL ALLOYING TECHNIQUE
    KOU, XC
    QIANG, WJ
    KRONMULLER, H
    SCHULTZ, L
    [J]. JOURNAL OF APPLIED PHYSICS, 1993, 74 (11) : 6791 - 6797
  • [10] MAGNETIC DOMAINS IN SINTERED FE-ND-B MAGNETS
    LIVINGSTON, JD
    [J]. JOURNAL OF APPLIED PHYSICS, 1985, 57 (08) : 4137 - 4139