Direct observation of ferromagnetism in grain boundary phase of Nd-Fe-B sintered magnet using soft x-ray magnetic circular dichroism

T. Nakamura; A. Yasui; Y. Kotani; T. Fukagawa; T. Nishiuchi; H. Iwai; T. Akiya; T. Ohkubo; Y. Gohda; K. Hono; S. Hirosawa

doi:10.1063/1.4902329

Direct observation of ferromagnetism in grain boundary phase of Nd-Fe-B sintered magnet using soft x-ray magnetic circular dichroism

T. Nakamura, A. Yasui, Y. Kotani, T. Fukagawa, T. Nishiuchi, H. Iwai, T. Akiya, T. Ohkubo, Y. Gohda, K. Hono, S. Hirosawa

International Center for Synchrotron Radiation Innovation Smart (SRIS)

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Abstract

We have investigated the magnetism of the grain boundary (GB) phase in a Nd_14.0Fe_79.7Cu_0.1B_6.2 sintered magnet using soft x-ray magnetic circular dichroism (XMCD) at the Fe L_2,3-edges. Soft XMCD spectra were measured from the fractured surface that was confirmed to be covered with a thin GB phase by Auger electron spectroscopy. The magnetic moment of Fe in the GB phase was estimated to be m_GB = 1:4 μ_B at 30°C using the sum rule analysis for XMCD spectra, which is 60% of that of Fe in the Nd₂Fe₁₄B compound. The temperature dependence of m_GB evaluated with reference to Fe in the Nd₂Fe₁₄B phase indicated that the Curie temperature of the GB phase is more than 50°C lower compared to that of Nd₂Fe₁₄B.

Original language	English
Article number	202404
Journal	Applied Physics Letters
Volume	105
Issue number	20
DOIs	https://doi.org/10.1063/1.4902329
Publication status	Published - 2014 Nov 17

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title = "Direct observation of ferromagnetism in grain boundary phase of Nd-Fe-B sintered magnet using soft x-ray magnetic circular dichroism",

abstract = "We have investigated the magnetism of the grain boundary (GB) phase in a Nd14.0Fe79.7Cu0.1B6.2 sintered magnet using soft x-ray magnetic circular dichroism (XMCD) at the Fe L2,3-edges. Soft XMCD spectra were measured from the fractured surface that was confirmed to be covered with a thin GB phase by Auger electron spectroscopy. The magnetic moment of Fe in the GB phase was estimated to be mGB = 1:4 μB at 30°C using the sum rule analysis for XMCD spectra, which is 60% of that of Fe in the Nd2Fe14B compound. The temperature dependence of mGB evaluated with reference to Fe in the Nd2Fe14B phase indicated that the Curie temperature of the GB phase is more than 50°C lower compared to that of Nd2Fe14B.",

author = "T. Nakamura and A. Yasui and Y. Kotani and T. Fukagawa and T. Nishiuchi and H. Iwai and T. Akiya and T. Ohkubo and Y. Gohda and K. Hono and S. Hirosawa",

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doi = "10.1063/1.4902329",

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T1 - Direct observation of ferromagnetism in grain boundary phase of Nd-Fe-B sintered magnet using soft x-ray magnetic circular dichroism

AU - Nakamura, T.

AU - Yasui, A.

AU - Kotani, Y.

AU - Fukagawa, T.

AU - Nishiuchi, T.

AU - Iwai, H.

AU - Akiya, T.

AU - Ohkubo, T.

AU - Gohda, Y.

AU - Hono, K.

AU - Hirosawa, S.

PY - 2014/11/17

Y1 - 2014/11/17

N2 - We have investigated the magnetism of the grain boundary (GB) phase in a Nd14.0Fe79.7Cu0.1B6.2 sintered magnet using soft x-ray magnetic circular dichroism (XMCD) at the Fe L2,3-edges. Soft XMCD spectra were measured from the fractured surface that was confirmed to be covered with a thin GB phase by Auger electron spectroscopy. The magnetic moment of Fe in the GB phase was estimated to be mGB = 1:4 μB at 30°C using the sum rule analysis for XMCD spectra, which is 60% of that of Fe in the Nd2Fe14B compound. The temperature dependence of mGB evaluated with reference to Fe in the Nd2Fe14B phase indicated that the Curie temperature of the GB phase is more than 50°C lower compared to that of Nd2Fe14B.

AB - We have investigated the magnetism of the grain boundary (GB) phase in a Nd14.0Fe79.7Cu0.1B6.2 sintered magnet using soft x-ray magnetic circular dichroism (XMCD) at the Fe L2,3-edges. Soft XMCD spectra were measured from the fractured surface that was confirmed to be covered with a thin GB phase by Auger electron spectroscopy. The magnetic moment of Fe in the GB phase was estimated to be mGB = 1:4 μB at 30°C using the sum rule analysis for XMCD spectra, which is 60% of that of Fe in the Nd2Fe14B compound. The temperature dependence of mGB evaluated with reference to Fe in the Nd2Fe14B phase indicated that the Curie temperature of the GB phase is more than 50°C lower compared to that of Nd2Fe14B.

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JF - Applied Physics Letters

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Direct observation of ferromagnetism in grain boundary phase of Nd-Fe-B sintered magnet using soft x-ray magnetic circular dichroism

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