Interfacial exchange interactions and magnetism of 
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 bilayers

Yanes, Rocío; Simon, Eszter; Keller, Sebastian; Nagyfalusi, Balázs; Khmelevsky, Sergii; Szunyogh, L.; Nowak, Ulrich

doi:10.1103/physrevb.96.064435

Cited by 3 publications

(2 citation statements)

References 41 publications

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“…Antiferromagnetic materials can complement or even replace ferromagnetic (FM) components in spintronic devices with improved properties due to their enhanced stability against the perturbation via external magnetic fields. Many technologically important effects have already been implemented using an AFM material as the main element of the system, such as the ultrafast spin dynamics, magnetotransport, or exchange bias effects [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Noncollinear antiferromagnetic states in Ru-based Heusler compounds induced by biquadratic coupling

Simon

Donges

Szunyogh

et al. 2020

Phys. Rev. Materials

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We investigate the magnetic properties of Ru 2 MnZ (Z = Sn, Sb, Ge, Si) chemically ordered, full Heusler compounds for zero as well as finite temperatures. Based on first-principles calculations we derive the interatomic isotropic bilinear and biquadratic couplings between Mn atoms from the paramagnetic state. We find frustrated isotropic couplings for all compounds and, in the case of Z = Si and Sb, a nearest-neighbor biquadratic coupling that favors perpendicular alignment between the Mn spins. By using an extended classical Heisenberg model in combination with spin dynamics simulations we obtain the magnetic equilibrium states. From these simulations we conclude that the biquadratic coupling, in combination with the frustrated isotropic interactions, leads to noncollinear magnetic ground states in the Ru 2 MnSi and Ru 2 MnSb compounds. In particular, for these alloys we find two distinct, noncollinear ground states which are energetically equivalent and can be identified as 3Q and 4Q states on a frustrated fcc lattice. Investigating the thermal stability of the noncollinear phase we find that, in the case of Ru 2 MnSi, the multiple-Q phase undergoes a transition to the single Q phase, while in case of Ru 2 MnSb the corresponding transition is not obtained due to the larger magnitude of the nearest-neighbor biquadratic coupling.

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Section: Introductionmentioning

confidence: 99%

Noncollinear antiferromagnetic states in Ru-based Heusler compounds induced by biquadratic coupling

Simon

Donges

Szunyogh

et al. 2020

Phys. Rev. Materials

View full text Add to dashboard Cite

show abstract

“…Antiferromagnetic materials can complement or even replace ferromagnetic (FM) components in spintronic devices with improved properties due to their enhanced stability against the perturbation via external magnetic fields. Many technologically important effects have already been implemented using an AFM material as the main element of the system, such the ultrafast spin dynamics, magneto-transport, or exchange bias effects [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Non-collinear antiferromagnetic states in Ru-based Heusler compounds induced by biquadratic coupling

Simon,

Donges,

Szunyogh

et al. 2019

Preprint

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Heusler alloys for spintronic devices: review on recent development and future perspectives

Elphick

Frost

Samiepour

et al. 2021

Science and Technology of Advanced Materials

231

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Heusler alloys are theoretically predicted to become half-metals at room temperature (RT). The advantages of using these alloys are good lattice matching with major substrates, high Curie temperature above RT and intermetallic controllability for spin density of states at the Fermi energy level. The alloys are categorised into half- and full-Heusler alloys depending upon the crystalline structures, each being discussed both experimentally and theoretically. Fundamental properties of ferromagnetic Heusler alloys are described. Both structural and magnetic characterisations on an atomic scale are typically carried out in order to prove the half-metallicity at RT. Atomic ordering in the films is directly observed by X-ray diffraction and is also indirectly probed via the temperature dependence of electrical resistivity. Element specific magnetic moments and spin polarisation of the Heusler alloy films are directly measured using X-ray magnetic circular dichroism and Andreev reflection, respectively. By employing these ferromagnetic alloy films in a spintronic device, efficient spin injection into a non-magnetic material and large magnetoresistance are also discussed. Fundamental properties of antiferromagnetic Heusler alloys are then described. Both structural and magnetic characterisations on an atomic scale are shown. Atomic ordering in the Heusler alloy films is indirectly measured by the temperature dependence of electrical resistivity. Antiferromagnetic configurations are directly imaged by X-ray magnetic linear dichroism and polarised neutron reflection. The applications of the antiferromagnetic Heusler alloy films are also explained. The other non-magnetic Heusler alloys are listed. A brief summary is provided at the end of this review.

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Interfacial exchange interactions and magnetism of Ni2MnAl/Fe bilayers

Cited by 3 publications

References 41 publications

Noncollinear antiferromagnetic states in Ru-based Heusler compounds induced by biquadratic coupling

Noncollinear antiferromagnetic states in Ru-based Heusler compounds induced by biquadratic coupling

Non-collinear antiferromagnetic states in Ru-based Heusler compounds induced by biquadratic coupling

Heusler alloys for spintronic devices: review on recent development and future perspectives

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