Nanocrystalline FeNdB permanent magnets with enhanced remanence

Journal of Applied Physics - Tập 80 Số 3 - Trang 1667-1673 - 1996
Jan S. Bauer1, M. Seeger1, A. Zern1, H. Kronmüller1
1Max-Planck-Institut für Metallforschung, Institut für Physik, Heisenbergstraβe 1, D-70569 Stuttgart, Germany

Tóm tắt

Isotropic nanocrystalline exchange coupled FeNdB magnets with enhanced remanence were produced using the melt spinning procedure. Starting from nearly single phase Fe14Nd2B magnets, the content of additional α-Fe in composite magnets was stepwise increased up to 40 vol % by reducing the Nd and B content. The maximum remanence of JR=1.25 T was found in composite magnets containing 30 vol % α-Fe, the maximum energy product reaches the value (BH)max=185 kJ/m3, whereas the coercive field is μ0HC=0.53 T for this composition. The microstructural investigations of the composite magnets reveal two characteristic maxima in the grain size distribution at about 15 and 25 nm corresponding to the α-Fe phase and to the Fe14Nd2B phase, respectively. The influence of the exchange coupling on the coercive field can be described by a microstructural parameter αex. From the temperature dependence of the coercive field the microstructural parameters αKαex and Neff are determined.

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Tài liệu tham khảo

1984, J. Appl. Phys., 55, 2083, 10.1063/1.333572

1984, J. Appl. Phys., 55, 2078, 10.1063/1.333571

1948, Philos. Trans. R. Soc., 240, 599

1988, J. Appl. Phys., 64, 5299, 10.1063/1.342398

1988, J. Appl. Phys., 63, 3507, 10.1063/1.341165

1990, J. Magn. Magn. Mater., 101, 360

1994, J. Magn. Magn. Mater., 138, 291

1991, IEEE Trans. Magn., MAG-27, 3588

1993, IEEE Trans. Magn., MAG-29, 2860

1994, Phys. Rev. B, 49, 6100, 10.1103/PhysRevB.49.6100

1995, J. Magn. Magn. Mater., 150, 329, 10.1016/0304-8853(95)00298-7

1988, J. Phys. (Paris), 49, C8

1993, J. Magn. Magn. Mater., 124, 1, 10.1016/0304-8853(93)90060-F

1993, J. Magn. Magn. Mater., 128, 302, 10.1016/0304-8853(93)90475-H

1993, J. Magn. Magn. Mater., 128, 307, 10.1016/0304-8853(93)90476-I

1994, J. Appl. Phys., 75, 6649, 10.1063/1.356883

1995, J. Appl. Phys., 67, 563

1988, J. Magn. Magn. Mater., 74, 291, 10.1016/0304-8853(88)90202-8

1990, J. Magn. Magn. Mater., 88, L267, 10.1016/0304-8853(90)90648-A

1988, J. Mater. Res., 3, 45, 10.1557/JMR.1988.0045

1988, IEEE Trans. Magn., MAG-24, 1921

1990, J. Magn. Magn. Mater., 86, 177, 10.1016/0304-8853(90)90119-B

1991, J. Mag. Soc. Jpn., 15, 6

1994, J. Magn. Magn. Mater., 130, 165, 10.1016/0304-8853(94)90670-X

1995, J. Magn. Magn. Mater., 153, 35

1995, J. Magn. Magn. Mater., 139, 323, 10.1016/0304-8853(94)00488-9

1995, J. Magn. Magn. Mater., 151, 193, 10.1016/0304-8853(95)00375-4

1994, Phys. Rev. B, 50, 3849, 10.1103/PhysRevB.50.3849

Thông tin
Thông tin xuất bản

Journal of Applied Physics

Tập 80 Số 3

1667-1673

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