Forced Volume Magnetostriction and Induced Moment in GdCo<sub>2</sub>

Shiga, M.; Minakata, R.; Tsuchida, Takashi; Nakamura, Yoji

doi:10.1143/jpsj.42.814

Cited by 12 publications

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“…According to Shiga et al, the ferrimagnetic arrangement causes the negative value of the forced volume magnetostriction as observed in x-GdCo 2 and x-GdNi 2 at the lowest tenperature. 5,11) As we find the positive forced volume magnetostriction, the ferrimagnetism is unacceptable as the ground state of a-Gd 67 Ni 33 and a-Gd 65 Co 35 . The last description is the ferromagnetism with wandering axes due to the weak random magnetic anisotropy where each axis of the moment has somewhat a different angle from the neighbors.…”

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confidence: 81%

“…2,3) It is well known that the compound shows a large magnetovolume effect as follows: the magnetic transition temperature T C decreases remarkably with increasing the pressure; a negative forced volume magnetostriction at low temperatures changes its sign to a positive value above about 250 K; a large positive spontaneous volume magnetostriction is observed below T C . [4][5][6] These volume magnetostrictions were explained in a phenomenological way from the magnetic moment of Co induced by the internal magnetic field from surrounding Gd atoms as well as the external applied field. 5) According to the explanation, we can expect the magnetovolume effect in the system where Co has the magnetic moment whether the atomic arrangement of the system is crystalline or amorphous.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6] These volume magnetostrictions were explained in a phenomenological way from the magnetic moment of Co induced by the internal magnetic field from surrounding Gd atoms as well as the external applied field. 5) According to the explanation, we can expect the magnetovolume effect in the system where Co has the magnetic moment whether the atomic arrangement of the system is crystalline or amorphous. In fact the effect such as a strong dependence of T C on pressure, large spontaneous and forced volume magnetostrictions below T C has been observed for an amorphous Gd-rich Gd-Co magnet.…”

Section: Introductionmentioning

confidence: 99%

“…In x-GdCo 2 and x-GdNi 2 ð@!=@BÞ 0 is negative because of the ferrimagnetism. 5,11) These are why we do not apply eq. (12) to a-Gd 65 Co 35 , x-GdCo 2 and x-GdNi 2 .…”

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confidence: 99%

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The Magnetovolume Effect of an Amorphous Magnet Gd₆₇Ni₃₃

et al. 2003

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We have observed a large magnetovolume effect in a melt spun Gd-rich amorphous magnet Gd 67 Ni 33 . The magnet shows the forced volume magnetostriction of a positive value of 3:76 Â 10 À5 T À1 at 4.4 K, which is almost as same as that of a typical Invar alloy Fe 65 Ni 35 , and the spontaneous volume magnetostriction of 1:97 Â 10 À3 at 6.9 K. Both volume magnetostrictions are proportional to the square of temperature. They are explained in the framework of spin fluctuation theory for weak itinerant electron magnets. The effect supports that the Ni constituent has a magnetic moment in the amorphous phase with such a low Ni concentration unlike crystalline Gd-Ni compounds. We propose a simple relation of estimating the magnetic moment which causes the magnetovolume effect. It gives the Ni moment of 0.61 B per atom at 0 K and the magnetovolume coupling constant of 1:20 Â 10 À14 A À2 m 2 . We also discuss the arrangement of the magnetic moment in the ground state.

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confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In x-GdCo 2 and x-GdNi 2 ð@!=@BÞ 0 is negative because of the ferrimagnetism. 5,11) These are why we do not apply eq. (12) to a-Gd 65 Co 35 , x-GdCo 2 and x-GdNi 2 .…”

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confidence: 99%

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