Origin of magnetic frustrations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi><mml:mo>−</mml:mo><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow></mml:math>Invar alloys

Ruban, Andrei V.; Katsnelson, M. I.; Olovsson, Weine; Simak, Sergei I.; Abrikosov, Igor A.

doi:10.1103/physrevb.71.054402

Cited by 77 publications

(71 citation statements)

References 29 publications

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“…Magnetic and lattice degrees of freedom are especially strongly coupled in -Fe, which is confirmed by the results of recent first-principles calculations [22,30,34,35]. As a result, magnetic ordering will be accompanied by spontaneous deformations of the crystal lattice.…”

Section: Introductionsupporting

confidence: 65%

“…Neutron scattering data for the alloy Fe 70 Ni 30 [23] demonstrate that atomic complexes with a strong short-range order of the martensite-phase type emerge in the premartensitic region. Therefore, one can assume that a nonclassical (shear) scheme of the phase transition is realized also for    transformation in iron-based alloys but its mechanism is more complicated than for the Hume-Rothery alloys and cannot be described in terms of individual phonon soft modes.…”

Section: Introductionmentioning

confidence: 99%

“…According to Ref. [24], coupled magnetovolume fluctuations [25][26][27][28][29][30] responsible also for Invar behavior of Fe-Ni alloys can play an essential role. The situation looks paradoxical: the    transformation in iron was historically a prototype of martensitic transitions at all but this case remains still rather poorly understood, in comparison with many cases discovered later.…”

Section: Introductionmentioning

confidence: 99%

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Effect of magnetism on kinetics of γ–α transformation and pattern formation in iron

Razumov¹,

Gornostyrev²,

Katsnelson³

2013

J. Phys.: Condens. Matter

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Abstract. Kinetics of polymorphous  - transformation in Fe is studied numerically within a model taking into account both lattice and magnetic degrees of freedom, based on first-principle calculations of the total energy for different magnetic states. It is shown that magnetoelastic phenomena, namely, a strong sensitivity of the potential relief along the Bain deformation path to the magnetic state, are crucial for the picture of the transformation. With the temperature increase, a scenario of the phase transformation evolves from a homogeneous lattice instability at T < M S (M S is the temperature of the beginning of the martensitic transformation) to the growth and nucleation of embryos of the new phase at T > M S . In the latter case, a stage of formation of a tweed-like structure occurs, with a strong short-range order and slow interphase fluctuations.MSC: 74N10, 74N15, 82B26, 82B80, 82C26, 37K60

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Section: Introductionsupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of magnetism on kinetics of γ–α transformation and pattern formation in iron

Razumov¹,

Gornostyrev²,

Katsnelson³

2013

J. Phys.: Condens. Matter

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show abstract

“…It can be expected that the vertex corrections are less important for the pair exchange interactions (especially between more distant sites) than for the on-site exchange interactions, but a thorough analysis of this point remains yet to be performed. A recent study using a supercell approach for random fcc Fe 0.5 Ni 0.5 alloys proves that the CPA-averaged exchange interactions (24) agree reasonably well with averages from a 16-atom supercell [99]. Let us now consider the case of two isolated impurities in a non-magnetic host.…”

Section: Substitutional Impurities and Disordered Alloysmentioning

confidence: 99%

Exchange interactions, spin waves, and transition temperatures in itinerant magnets

Turek

Kudrnovský

Drchal

et al. 2006

Philosophical Magazine

143

128

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“…In this regime, the Ni sublattice remains almost collinear with the average magnetization, but the Fe sublattice is essentially frustrated and noncollinear even at very low temperature. This frustration is caused by long-range oscillating exchange interactions 31 and due to local environment e®ects that yield a huge dispersion of the nearest-neighbor exchange parameters, 32 which results in a decrease of the Curie temperature despite the fact that the magnitude of the exchange interactions increases. 33 Although the assessment of such frustrated magnetism goes beyond the nearest-neighbor Heisenberg model employed here, we anticipate that an essentially noncollinear Fe environment can allow for an e±cient transfer of angular momentum between the sublattices (large parameter e Þ, which in the high-temperature limit yields an acceleration of the demagnetization of Ni, since Ni < Fe .…”

Section: Phenomenological Model Of Ultrafast Magnetization Dynamics Imentioning

confidence: 99%

Ultrafast and Distinct Spin Dynamics in Magnetic Alloys

Radu

Stamm

Eschenlohr

et al. 2015

SPIN

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Controlling magnetic order on ultrashort timescales is crucial for engineering the next-generation magnetic devices that combine ultrafast data processing with ultrahigh-density data storage. An appealing scenario in this context is the use of femtosecond (fs) laser pulses as an ultrafast, external stimulus to fully set the orientation and the magnetization magnitude of a spin ensemble. Achieving such control on ultrashort timescales, e.g., comparable to the excitation event itself, remains however a challenge due to the lack of understanding the dynamical behavior of the key parameters governing magnetism: The elemental magnetic moments and the exchange interaction. Here, we investigate the fs laser-induced spin dynamics in a variety of multi-component alloys and reveal a dissimilar dynamics of the constituent magnetic moments on ultrashort timescales. Moreover, we show that such distinct dynamics is a general phenomenon that can be exploited to engineer new magnetic media with tailor-made, optimized dynamic properties. Using phenomenological considerations, atomistic modeling and time-resolved X-ray magnetic circular dichroism (XMCD), we demonstrate demagnetization of the constituent sub-lattices on signi¯-cantly di®erent timescales that depend on their magnetic moments and the sign of the exchange interaction. These results can be used as a \recipe" for manipulation and control of magnetization dynamics in a large class of magnetic materials.

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Origin of magnetic frustrations inFe−NiInvar alloys

Cited by 77 publications

References 29 publications

Effect of magnetism on kinetics of γ–α transformation and pattern formation in iron

Effect of magnetism on kinetics of γ–α transformation and pattern formation in iron

Exchange interactions, spin waves, and transition temperatures in itinerant magnets

Ultrafast and Distinct Spin Dynamics in Magnetic Alloys

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