High field magnetic properties of Fe-Pt Invar alloys

Caporaletti, O.; Graham, George

doi:10.1016/0304-8853(80)90006-2

Cited by 16 publications

(4 citation statements)

References 24 publications

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“…Our calculated moments on Fe sites cover the range from 2.63 µ B for Fe 0.65 Ni 0.35 to 2.89 µ B for Fe 0.68 Pd 0.32 ; the moments on Ni, Pt, and Pd sites are found to span the interval from 0.3 µ B for Fe 0.68 Pd 0.32 to 0.64 µ B for Fe 0.2 Ni 0.8 . All these results yield fair agreement with available DFT data 8,10,22,23,28 and experimental measurements 29,30 .…”

Section: Results and Analysissupporting

confidence: 88%

Numerical Simulations of the Invar Effect in Fe-Ni, Fe-Pt, and Fe-Pd Ferromagnets

Liot¹,

Hooley²

2012

Preprint

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The Invar effect in ferromagnetic Fe-Ni, Fe-Pt, and Fe-Pd alloys is investigated theoretically by means of a computationally efficient scheme. The procedure can be divided into two stages: study of magnetism and calculations of structural properties. In the first stage, an Ising model is considered and fractions of Fe moments which point up as a function of temperature are determined. In the second stage, density-functional theory calculations are performed to evaluate free energies of alloys in partially disordered local moment states as a function of lattice constant for various temperatures. Extensive tests of the scheme are carried out by comparing simulation results for thermal expansion coefficients of Fe1−xNix with x = 0.35, 0.4, . . . , 0.8, Fe0.72Pt0.28, and Fe0.68Pd0.32 with measurements. The scheme is found to perform well, at least qualitatively, throughout the whole spectrum of test compounds. For example, the significant reduction of the thermal expansion coefficient of Fe1−xNix as x decreases from 0.55 to 0.35 near room temperature, which was discovered by Guillaume, is reliably reproduced. As a result of the overall qualitative agreement between theory and experiment, it appears that the Invar effect in Fe-Ni alloys can be investigated within the same computational framework as Fe-Pt and Fe-Pd.

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Section: Results and Analysissupporting

confidence: 88%

Numerical Simulations of the Invar Effect in Fe-Ni, Fe-Pt, and Fe-Pd Ferromagnets

Liot¹,

Hooley²

2012

Preprint

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“…At 10 K, the average magnetic moment per atom, 2.02 B , corresponds to previous measurements on Fe-Pt samples. 40,41 The relative magnetization M͑T , p͒ / M͑T ,0͒ at ambient temperature is in very good agreement with Matsushita et al 39 results ͓at about 1 GPa, we observe a value of 0.32 compared with 0.4 ͑Ref. 39͔͒.…”

Section: A Fe-ptsupporting

confidence: 91%

High-pressure magnetic study of Fe-Ni and Fe-Pt Invar alloys

et al. 2009

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International audienceMagnetic properties of Fe64Ni36 and Fe-Pt Invar alloys under high pressure have been investigated through x-ray magnetic circular dichroism XMCD up to 12 GPa at ambient temperature and superconducting quantum interference device magnetometer up to 1 GPa for different isotherms, from 10 to 300 K. Results obtained with both techniques on Fe-Pt samples can be well interpreted through the 2-state interpretation of the Invar effect. For the Fe64Ni36 alloy, the relative evolution of the iron magnetic moment at 300 K, measured through XMCD, shows the existence of a plateau between 4 and 10 GPa, also expected within this approach. In the low-pressure range, the evolution of magnetization indicates that the itinerant character of Fe-Ni alloys may affect the transition

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“…The reported experimental results in this case differ from each other. The localized components of the magnetic moments for Fe (2.03±0.02 µ B ) and Pt (0.34±0.08 µ B ) were estimated from spin polarized neutron diffraction measurements by Ito et al [64], while the magnetization measurements of Caporaletti and Graham [65] indicated moments of 2.75 and 0.45 µ B for Fe and Pt, respectively. The values of average magnetic moments quoted in the Landoldt series for different experiments are 2.02 and 2.27 µ B .…”

Section: Disordered Alloysmentioning

confidence: 99%

Magnetic properties of X–Pt (X = Fe,Co,Ni) alloy systems

Paudyal¹,

Saha‐Dasgupta²,

Mookerjee³

2004

J. Phys.: Condens. Matter

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We have studied the electronic and magnetic properties of Fe-Pt, Co-Pt and Ni-Pt alloy systems in ordered and disordered phases. The influence of various exchange-correlation functionals on values of equilibrium lattice parameters and magnetic moments in ordered Fe-Pt, Co-Pt and Ni-Pt alloys have been studied using linearized muffin-tin orbital method. The electronic structure calculations for the disordered alloys have been carried out using augmented space recursion technique in the framework of tight binding linearized muffin-tin orbital method. The effect of short range order has also been studied in the disordered phase of these systems. The results show good agreements with available experimental values.

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High field magnetic properties of Fe-Pt Invar alloys

Cited by 16 publications

References 24 publications

Numerical Simulations of the Invar Effect in Fe-Ni, Fe-Pt, and Fe-Pd Ferromagnets

Numerical Simulations of the Invar Effect in Fe-Ni, Fe-Pt, and Fe-Pd Ferromagnets

High-pressure magnetic study of Fe-Ni and Fe-Pt Invar alloys

Magnetic properties of X–Pt (X = Fe,Co,Ni) alloy systems

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