Finite-temperature magnetism of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>Pd</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Co</mml:mtext></mml:mrow><mml

Polesya, S.; Mankovsky, S.; Šipr, O.; Meindl, Wolfgang; Strunk, Christoph; Ebert, H.

doi:10.1103/physrevb.82.214409

Cited by 44 publications

(39 citation statements)

References 50 publications

(53 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The term characterizing the longitudinal contribution was discussed previously [37]. The response function χ kj occuring in Eq.…”

Section: Resultsmentioning

confidence: 99%

“…3). As the Rh magnetic moment occurs essentially due to the spin-dependent hybridization of the Rh electronic states with the electronic states of neighboring Fe atoms, it is represented in MC simulations through the average magnetic moment on the first Fe neighbor shell around the Rh atoms, leading to an approximate form for the susceptibility function [37] …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Finite-temperature magnetism of FeRh compounds

Polesya¹,

Mankovsky²,

Ködderitzsch³

et al. 2016

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…The term characterizing the longitudinal contribution was discussed previously [37]. The response function χ kj occuring in Eq.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Finite-temperature magnetism of FeRh compounds

Polesya¹,

Mankovsky²,

Ködderitzsch³

et al. 2016

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, we have performed here the calculations accounting for Fe-Pt interactions only to investigate their effect on the shape of the Skyrmion, following the scheme described in Ref. [41]. Based on this, we conclude that the Pt contribution could modify the phase diagram, but these changes should not be crucial.…”

Section: Skyrmion Magnetic Structurementioning

confidence: 91%

Skyrmion magnetic structure of an ordered FePt monolayer deposited onPt(111)

et al. 2014

Self Cite

View full text Add to dashboard Cite

The effect of the Dzyaloshinsky-Moriya interaction on the magnetic structure of an ordered FePt monolayer deposited on Pt (111) surface has been investigated. In the ground state, the pronounced anisotropic geometry of the FePt layer with alternating Fe and Pt chains gives rise to a helimagnetic structure with a strong difference in the helicity period along the chains and perpendicular to them. In the presence of an external magnetic field, the region of stable Skyrmion magnetic structures in the B − T phase diagram has been demonstrated via Monte Carlo simulations using the parameters obtained within first-principles electronic structure calculations. The present study demonstrates clearly that the ratio of the exchange coupling parameters J/D for a deposited magnetic filmbeing of central importance for the formation of Skyrmions -can be manipulated by growing an overlayer of 2-dimensional (2D) compounds with the atoms carrying spontaneous magnetic moments separated by the atoms of non-magnetic elements.

show abstract

“…Related is also the work by Polesya et al 21 who adopt a model for FePd and CoPt alloys. In these works, the weak moments of Pd or Pt are determined from the strong moments of their neighbors via the susceptibility.…”

Section: H({mmentioning

confidence: 99%

“…17 It is widely used in methods where the Green function is available. 1,2,8,[18][19][20][21][22][23][24] A variant of this approach is the use of the disorder-local-moment (DLM) reference state 11 as an approximation to the magnetic disorder at the Curie temperature, from which one obtains exchange parameters 25,26 in a manner analogous to the method of infinitesimal rotations. 17 Higher-order interactions (e.g.…”

Section: Introductionmentioning

confidence: 99%

Exchange interactions and local-moment fluctuation corrections in ferromagnets at finite temperatures based on noncollinear density-functional calculations

et al. 2013

View full text Add to dashboard Cite

We explore the derivation of interatomic exchange interactions in ferromagnets within density-functional theory (DFT) and the mapping of DFT results onto a spin Hamiltonian. We delve into the problem of systems comprising atoms with strong spontaneous moments together with atoms with weak induced moments. All moments are considered as degrees of freedom, with the strong moments thermally fluctuating only in angle and the weak moments thermally fluctuating in angle and magnitude. We argue that a quadratic dependence of the energy on the weak local moments magnitude, which is a good approximation in many cases, allows for an elimination of the weak-moment degrees of freedom from the thermodynamic expressions in favor of a renormalization of the Heisenberg interactions among the strong moments. We show that the renormalization is valid at all temperatures accounting for the thermal fluctuations and resulting in temperature-independent renormalized interactions. These are shown to be the ones directly derived from total-energy DFT calculations by constraining the strong-moment directions, as is done e.g. in spin-spiral methods. We furthermore prove that within this framework the thermodynamics of the weak-moment subsystem, and in particular all correlation functions, can be derived as polynomials of the correlation functions of the strong-moment subsystem with coefficients that depend on the spin susceptibility and that can be calculated within DFT. These conclusions are rigorous under certain physical assumptions on the measure in the magnetic phase space. We implement the scheme in the full-potential linearized augmented plane wave (FLAPW) method using the concept of spin-spiral states, considering applicable symmetry relations and the use of the magnetic force theorem. Our analytical results are corroborated by numerical calculations employing DFT and a Monte Carlo method.

show abstract

Finite-temperature magnetism ofFexPd1−xandCo

Cited by 44 publications

References 50 publications

Finite-temperature magnetism of FeRh compounds

Finite-temperature magnetism of FeRh compounds

Skyrmion magnetic structure of an ordered FePt monolayer deposited onPt(111)

Exchange interactions and local-moment fluctuation corrections in ferromagnets at finite temperatures based on noncollinear density-functional calculations

Contact Info

Product

Resources

About