Pressure effects on the magnetic properties of FeCuZr studied by x-ray magnetic circular dichroism: Evidence of weakening of ferromagnetism in FeCuZr alloys

Martı́nez, Antonio; Romero, J.J.; Bartolomé, Fernando; Garcı́a, L. M.; Baudelet, F.; Hernando, A.; Crespo, P.

doi:10.1063/1.4735300

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…In those cases, the contraction of the structure due to the increase of pressure reduces both magnetization and T C . 11,12 Moreover, considering the Slater-Pauling curve for Fe-Co, the magnetic moment of Fe atoms increases as the separation between atoms increases. 13 However, it should be noted that a distribution in the Fe-Fe distance intrinsic in the amorphous structures would produce a distribution of the exchange coupling constant, as studied by Gallagher et al 14 This also originates a broadening of the magnetocaloric peak.…”

Section: Resultsmentioning

confidence: 99%

Milling effects on magnetic properties of melt spun Fe-Nb-B alloy

Ipus

Blázquez

Franco

et al. 2014

Journal of Applied Physics

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Dependence of the magnetic and magnetoelastic properties of ( TbFe 2 ) 1−x B x melt-spun alloys on x J. Appl. Phys. 85, 4500 (1999) Fe 75 Nb 10 B 15 amorphous ribbons were grinded via ball milling to produce powder samples preserving the amorphous microstructure. A continuous increase of the Curie temperature with the milling time is observed as well as an enhancement of spontaneous magnetization, average hyperfine field, and magnetocaloric effect. This enhancement in the magnetic character of the samples as milling progresses is ascribed to an increase of the Fe-Fe distance. However, the peak entropy change reduces after grinding the ribbon sample. This effect could be related to a broader distribution of Curie temperatures in powdered samples. V C 2014 AIP Publishing LLC.

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Section: Resultsmentioning

confidence: 99%

Milling effects on magnetic properties of melt spun Fe-Nb-B alloy

Ipus

Blázquez

Franco

et al. 2014

Journal of Applied Physics

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Anisotropic Thermal Expansion and Cooperative Invar and Anti-Invar Effects in Mn Alloys

Yokoyama

Eguchi

2013

Phys. Rev. Lett.

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We have investigated thermal expansion of a tetragonal Mn(88)Ni(12) alloy by x-ray diffraction, Mn and Ni K-edge extended x-ray-absorption fine-structure spectroscopy, and the computational simulations based on the path-integral effective-classical-potential theory. It is found from the x-ray diffraction that the tetragonal lattice constant c exhibits almost no thermal expansion like an Invar alloy, while the lattice constant a shows even larger thermal expansion than usually expected from anharmonicity, implying significant anisotropy in thermal expansion. The extended x-ray-absorption fine-structure reveals that the Mn local environment is actually tetragonally distorted, while the Ni one retains its inherent cubiclike symmetry. Combined with the computational simulations, it is concluded that large thermal expansion along the a axis originates from the anti-Invar effect, while negligibly small thermal expansion along the c axis originates from the cooperative Invar effect. Namely, the tetragonally distorted more stable antiferromagnetic Mn state gives a significantly smaller (slightly longer) atomic radius along the a (c) axis than the radius of the spherical paramagnetic state.

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Pressure effects on the magnetic properties of FeCuZr studied by x-ray magnetic circular dichroism: Evidence of weakening of ferromagnetism in FeCuZr alloys

Cited by 2 publications

References 16 publications

Milling effects on magnetic properties of melt spun Fe-Nb-B alloy

Milling effects on magnetic properties of melt spun Fe-Nb-B alloy

Anisotropic Thermal Expansion and Cooperative Invar and Anti-Invar Effects in Mn Alloys

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