Ferromagnetism of (ScCa)Co2 Laves phase compound synthesized under high pressure

M. Ohta; M. Okada; H. Kakuta; Asaya Fujita; K. Fukamichi; Atsunori Kamegawa; H. Takamura

doi:10.1016/j.jallcom.2005.04.078

Ferromagnetism of (ScCa)Co₂ Laves phase compound synthesized under high pressure

M. Ohta, M. Okada, H. Kakuta, Asaya Fujita, K. Fukamichi, Atsunori Kamegawa, H. Takamura

ENG - Materials Science

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

1 Citation (Scopus)

Abstract

The appearance of ferromagnetism in (Sc_0.85Ca _0.15)Co₂ Laves phase synthesized under high pressure of 6 GPa was confirmed. A magnetically homogeneous state was achieved by applying pressure of 6 GPa in 1373 K for 48 h. This is the first study that confirmed a stable ferromagnetic state in exchange-enhanced Pauli paramagnet ScCo ₂-based compound system. The quantities of pressure P and magnetization M dependence of the Curie temperature T_C, dln T _C/dP and (dln T_C/dP)/(dln M/dP) = dln T_C/dln M for (Sc_0.85Ca_0.15)Co₂ are smaller than those for Lu(Co_{1 - x}Al_x)₂ compounds, and accordingly the magnetic moment of (Sc_0.85Ca_0.15)Co₂ is stiffer against pressure. The ratio of the spin wave stiffness constant D _s to T_C, D_s/T_C, in (Sc _0.85Ca_0.15)Co₂ is smaller than that of Lu(Co_{1 - x}Al_x)₂, implying that the spin wave in (Sc_0.85Ca_0.15)Co₂ spread over wider wavevector space.

Original language	English
Pages (from-to)	147-150
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	408-412
DOIs	https://doi.org/10.1016/j.jallcom.2005.04.078
Publication status	Published - 2006 Feb 9
Event	Proceedings of the Rare Earths'04 in Nara, Japan - Duration: 2004 Nov 7 → 2004 Nov 12

Keywords

Band magnetism
High-pressure synthesis
Pressure effect
Spin wave

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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@article{073cfcd3802846d99e0a36fcb28966e9,

title = "Ferromagnetism of (ScCa)Co2 Laves phase compound synthesized under high pressure",

abstract = "The appearance of ferromagnetism in (Sc0.85Ca 0.15)Co2 Laves phase synthesized under high pressure of 6 GPa was confirmed. A magnetically homogeneous state was achieved by applying pressure of 6 GPa in 1373 K for 48 h. This is the first study that confirmed a stable ferromagnetic state in exchange-enhanced Pauli paramagnet ScCo 2-based compound system. The quantities of pressure P and magnetization M dependence of the Curie temperature TC, dln T C/dP and (dln TC/dP)/(dln M/dP) = dln TC/dln M for (Sc0.85Ca0.15)Co2 are smaller than those for Lu(Co1 - xAlx)2 compounds, and accordingly the magnetic moment of (Sc0.85Ca0.15)Co2 is stiffer against pressure. The ratio of the spin wave stiffness constant D s to TC, Ds/TC, in (Sc 0.85Ca0.15)Co2 is smaller than that of Lu(Co1 - xAlx)2, implying that the spin wave in (Sc0.85Ca0.15)Co2 spread over wider wavevector space.",

keywords = "Band magnetism, High-pressure synthesis, Pressure effect, Spin wave",

author = "M. Ohta and M. Okada and H. Kakuta and Asaya Fujita and K. Fukamichi and Atsunori Kamegawa and H. Takamura",

year = "2006",

month = feb,

day = "9",

doi = "10.1016/j.jallcom.2005.04.078",

language = "English",

volume = "408-412",

pages = "147--150",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

note = "Proceedings of the Rare Earths'04 in Nara, Japan ; Conference date: 07-11-2004 Through 12-11-2004",

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TY - JOUR

T1 - Ferromagnetism of (ScCa)Co2 Laves phase compound synthesized under high pressure

AU - Ohta, M.

AU - Okada, M.

AU - Kakuta, H.

AU - Fujita, Asaya

AU - Fukamichi, K.

AU - Kamegawa, Atsunori

AU - Takamura, H.

PY - 2006/2/9

Y1 - 2006/2/9

N2 - The appearance of ferromagnetism in (Sc0.85Ca 0.15)Co2 Laves phase synthesized under high pressure of 6 GPa was confirmed. A magnetically homogeneous state was achieved by applying pressure of 6 GPa in 1373 K for 48 h. This is the first study that confirmed a stable ferromagnetic state in exchange-enhanced Pauli paramagnet ScCo 2-based compound system. The quantities of pressure P and magnetization M dependence of the Curie temperature TC, dln T C/dP and (dln TC/dP)/(dln M/dP) = dln TC/dln M for (Sc0.85Ca0.15)Co2 are smaller than those for Lu(Co1 - xAlx)2 compounds, and accordingly the magnetic moment of (Sc0.85Ca0.15)Co2 is stiffer against pressure. The ratio of the spin wave stiffness constant D s to TC, Ds/TC, in (Sc 0.85Ca0.15)Co2 is smaller than that of Lu(Co1 - xAlx)2, implying that the spin wave in (Sc0.85Ca0.15)Co2 spread over wider wavevector space.

AB - The appearance of ferromagnetism in (Sc0.85Ca 0.15)Co2 Laves phase synthesized under high pressure of 6 GPa was confirmed. A magnetically homogeneous state was achieved by applying pressure of 6 GPa in 1373 K for 48 h. This is the first study that confirmed a stable ferromagnetic state in exchange-enhanced Pauli paramagnet ScCo 2-based compound system. The quantities of pressure P and magnetization M dependence of the Curie temperature TC, dln T C/dP and (dln TC/dP)/(dln M/dP) = dln TC/dln M for (Sc0.85Ca0.15)Co2 are smaller than those for Lu(Co1 - xAlx)2 compounds, and accordingly the magnetic moment of (Sc0.85Ca0.15)Co2 is stiffer against pressure. The ratio of the spin wave stiffness constant D s to TC, Ds/TC, in (Sc 0.85Ca0.15)Co2 is smaller than that of Lu(Co1 - xAlx)2, implying that the spin wave in (Sc0.85Ca0.15)Co2 spread over wider wavevector space.

KW - Band magnetism

KW - High-pressure synthesis

KW - Pressure effect

KW - Spin wave

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DO - 10.1016/j.jallcom.2005.04.078

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EP - 150

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

T2 - Proceedings of the Rare Earths'04 in Nara, Japan

Y2 - 7 November 2004 through 12 November 2004

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