The antiferromagnetic-ferromagnetic transition in iron-rhodium alloys

McKinnon, J.B.; Melville, D.; Lee, E W

doi:10.1088/0022-3719/3/1s/306

Cited by 87 publications

(42 citation statements)

References 22 publications

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“…15) Figure 7 denotes the calculated result of the concentration dependence of volume change ðV FM {V AF3 Þ=V AF3 , where V FM and V AF3 are the calculated unit-cell volumes in the FM and AF3 states, respectively. The calculated volume changes are found to be a little larger than the observed values [13][14][15] at room temperature. However, it has been obtained that the volume change decreases as the concentration x increases for Fe(Rh 1Àx Pd x ).…”

Section: Summary and Discussionmentioning

confidence: 54%

“…Finally, we will discuss the large volume changes, Structure and Magnetism of Fe(Rh,Pd) Alloysassociated with the magnetic field-induced transition from the antiferromagnetic to ferromagnetic state, observed in FeRh 13,14) and Rh rich Fe(Rh,Pd) alloys. 15) Figure 7 denotes the calculated result of the concentration dependence of volume change ðV FM {V AF3 Þ=V AF3 , where V FM and V AF3 are the calculated unit-cell volumes in the FM and AF3 states, respectively.…”

Section: Summary and Discussionmentioning

confidence: 99%

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Structure and Magnetism of Fe(Rh,Pd) Alloys

2006

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First-principle band calculations of ordered 3d and 4d transition-metal alloys Fe(Rh,Pd) with the CsCl and CuAu-I type structures are carried out by a linear muffin-tin orbital method within an atomic sphere approximation, where Rh and Pd atoms are treated as virtual 4d-atoms with the atomic number averaged over the concentration. A generalized gradient correction for exchange-correlation potential is taken into account. Total energies for paramagnetic, ferromagnetic and three kinds of antiferromagnetic states are estimated as a function of lattice constants, a and c. Observed lattice constants and spin structures for the present alloys are well described by the present calculations.

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Section: Summary and Discussionmentioning

confidence: 54%

Section: Summary and Discussionmentioning

confidence: 99%

Structure and Magnetism of Fe(Rh,Pd) Alloys

2006

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“…14.0 mJ/g/K [15] or 12.58 mJ/g/K [16], is mainly attributed to the electronic contribution related to spin fluctuations on the Rh atoms. This observation implies a key role of the Rh induced magnetic moments for the stabilization of the FM state [16][17][18]. This idea was supported by theoretical investigations based on first-principles electronic structure calculations [3, 5-7, 10, 12].…”

Section: Introductionmentioning

confidence: 73%

Finite-temperature magnetism of FeRh compounds

Polesya¹,

Mankovsky²,

Ködderitzsch³

et al. 2016

Phys. Rev. B

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The temperature dependent stability of the magnetic phases of FeRh were investigated by means of total energy calculations with magnetic disorder treated within the uncompensated disordered local moment (uDLM) approach. In addition, Monte Carlo simulations based on the extended Heisenberg model have been performed, using exchange coupling parameters obtained from first principles. The crucial role and interplay of two factors in the metamagnetic transition in FeRh has been revealed, namely the dependence of the Fe-Fe exchange coupling parameters on the temperature-governed degree of magnetic disorder in the system and the stabilizing nature of the induced magnetic moment on Rh-sites. An important observation is the temperature dependence of these two competing factors.

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“…In this model the exchange parameter varies linearly with the lattice constant and changes sign for a critical value a c . However, experimental findings like the rather large entropy change 3,4,11,12,13 at T m , which is of the order of ∆S(T m ) ≈ 12.5 − 19.7 J kg −1 K −1 , as well as elastic properties could not correctly be described. 13 Tu et al…”

Section: In 1938 Fallotmentioning

confidence: 95%

Instability of the rhodium magnetic moment as the origin of the metamagnetic phase transition inα−FeRh

Gruner¹,

Hoffmann²,

Entel³

2003

Phys. Rev. B

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Based on ab initio total energy calculations we show that two magnetic states of rhodium atoms together with competing ferromagnetic and antiferromagnetic exchange interactions are responsible for a temperature induced metamagnetic phase transition, which experimentally is observed for stoichiometric α-FeRh. Taking into account the results of previous and newly performed firstprinciples calculations we present a spin-based model, which allows to reproduce this first-order metamagnetic transition by means of Monte Carlo simulations. Further inclusion of spacial variation of exchange parameters leads to a realistic description of the experimental magneto-volume effects in α-FeRh.

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The antiferromagnetic-ferromagnetic transition in iron-rhodium alloys

Cited by 87 publications

References 22 publications

Structure and Magnetism of Fe(Rh,Pd) Alloys

Structure and Magnetism of Fe(Rh,Pd) Alloys

Finite-temperature magnetism of FeRh compounds

Instability of the rhodium magnetic moment as the origin of the metamagnetic phase transition inα−FeRh

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