Cycloidal magnetic order in the compound IrMnSi

Eriksson, Therése; Bergqvist, Lars; Burkert, Till; Felton, Solveig; Tellgren, R.; Nordblad, Per; Eriksson, Olle; Andersson, Yvonne

doi:10.1103/physrevb.71.174420

Cited by 26 publications

(19 citation statements)

References 30 publications

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“…It should also be noted that the analysis we have pursued here relies on a DOS analysis, and is similar in nature to the analysis in Ref. 31, where a k space resolved quantity, i.e., the energy bands, was analyzed. In short, the argument in Ref.…”

Section: E Theoretical Magnetic Structurementioning

confidence: 97%

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Magnetic properties of selected Mn-based transition metal compounds withβ−Mnstructure: Experiments and theory

et al. 2005

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Two compounds, Mn 3 CoSi and Mn 3 CoGe have been synthesized and found to crystallize in the AlAu 4 type structure, an ordered form of the ␤ -Mn structure. The magnetic structure and properties have been studied by magnetometry and neutron powder diffraction and the theoretical work is based on first principles total energy calculations. Comparison is made with the magnetic properties of the isostructural compounds Mn 3 IrGe and Mn 3 IrSi. The solid solutions Mn 3 Ir 1−y Co y Si ͑0 ഛ y ഛ 1͒ and Mn 3 CoSi 1−x Ge x ͑0 ഛ x ഛ 1͒ are also studied. A noncollinear antiferromagnetic structure is experimentally observed for y = 0.20 as well as for x = 0.50 and 1.0, similar to that of Mn 3 IrSi and Mn 3 IrGe, with 120°angles between magnetic moments on a triangular network of Mn atoms, and this finding is corroborated by theoretical calculations. For y = 0.80-1.0 a transformation to a new type of magnetic structure takes place. The magnetic transition temperature decreases on decreasing unit cell dimension, with good qualitative agreement with the decay of the calculated interatomic exchange energy. Both theory and experiments find the magnitude of the Mn magnetic moment to decrease on decreasing unit cell volume, the same trend is found in calculations for ␤ -Mn.

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Section: E Theoretical Magnetic Structurementioning

confidence: 97%

“…In short, the argument in Ref. 31 ͑which in turn was based on Refs. 32 and 33͒ was that bands hybridize International Tables for Crystallography. FIG.…”

Section: E Theoretical Magnetic Structurementioning

confidence: 99%

Magnetic properties of selected Mn-based transition metal compounds withβ−Mnstructure: Experiments and theory

et al. 2005

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“…The discovery of a rare Lifshitz multicritical behaviour in MnP 1,2 initiated an extensive study on the family of related Mn-based ternary compounds adopting orthorhombic crystal structures of the TiNiSi-type. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Magnetic structures of these materials are ranging from a commensurate antiferromagnetic (AFM) ordering through collinear and non-collinear incommensurate helical, cycloidal and fan spin structures to simple ferromagnetic (FM) states. [7][8][9][10][11][12] The appearance of noncollinear spin arrangements makes these compounds of interest because of their potential for future applications in spintronics.…”

Section: Introductionmentioning

confidence: 99%

Complex magnetic phase diagram of metamagnetic MnPtSi

Gamża

Schnelle²,

Rösner³

et al. 2019

Phys. Rev. B

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The magnetic, thermal and transport properties as well as electronic band structure of MnPtSi are reported. MnPtSi is a metal that undergoes a ferromagnetic transition at TC = 340(1) K and a spin-reorientation transition at TN = 326(1) K to an antiferromagnetic phase. First-principles electronic structure calculations indicate a not-fully polarized spin state of Mn in a d 5 electron configuration with J = S = 3/2, in agreement with the saturation magnetization of 3 µB in the ordered state and the observed paramagnetic effective moment. A sizeable anomalous Hall effect in the antiferromagnetic phase alongside the computational study suggests that the antiferromagnetic structure is non-collinear. Based on thermodynamic and resistivity data we construct a magnetic phase diagram. Magnetization curves M (H) at low temperatures reveal a metamagnetic transition of spin-flop type. The spin-flopped phase terminates at a critical point with Tcr ≈ 300 K and Hcr ≈ 10 kOe, near which a peak of the magnetocaloric entropy change is observed. Using Arrott plot analysis and magnetoresistivity data we argue that the metamagnetic transition is of a firstorder type, whereas the strong field dependence of TN and the linear relationship of the TN with M 2 hint at its magnetoelastic nature.

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“…Indeed, within the same family of alloys, one finds very different magnetic behaviors: itinerant and localized magnetism, ferrimagnetism, antiferromagnetism, helimagnetism, and other types of noncollinear ordering. [30][31][32][33][34][35][36] Despite a key role of the magnetism in the properties of Heusler alloys, experimental and theoretical studies of the exchange interactions in Heusler alloys are still rare. The first important information on the exchange coupling in these systems was provided by the inelastic neutron scattering experiments of Noda and Ishikawa 37 and Tajima et al 38 in the late 1970s.…”

Section: Introductionmentioning

confidence: 99%

Role of conduction electrons in mediating exchange interactions in Mn-based Heusler alloys

2008

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Because of the large spatial separation of the Mn atoms in Heusler alloys ͑d Mn-Mn Ͼ 4 Å͒, the Mn 3d states belonging to different atoms do not overlap considerably. Therefore, an indirect exchange interaction between Mn atoms should play a crucial role in the ferromagnetism of the systems. To study the nature of the ferromagnetism of various Mn-based semi-and full-Heusler alloys, we perform a systematic first-principles calculation of the exchange interactions in these materials. The calculation of the exchange parameters is based on the frozen-magnon approach. The Curie temperature is estimated within the mean-field approximation. The calculations show that the magnetism of the Mn-based Heusler alloys depends strongly on the number of conduction sp electrons, their spin polarization, and the position of the unoccupied Mn 3d states with respect to the Fermi level. Various magnetic phases are obtained depending on the combination of these characteristics. The magnetic phase diagram is determined at zero temperature. The results of the calculations are in good agreement with available experimental data. Anderson's s-d model is used to perform a qualitative analysis of the obtained results. The conditions leading to a diverse magnetic behavior are identified. If the spin polarization of the conduction electrons at the Fermi energy is large and the unoccupied Mn 3d states lie well above the Fermi level, a Ruderman-Kittel-Kasuya-Yoshida-type ferromagnetic interaction is dominating. On the other hand, the contribution of the antiferromagnetic superexchange becomes important if unoccupied Mn 3d states lie close to the Fermi energy. The resulting magnetic behavior depends on the competition of these two exchange mechanisms. The calculation results are in good correlation with the conclusions made on the basis of the Anderson s-d model which provides useful framework for the analysis of the results of first-principles calculations and helps to formulate the conditions for high Curie temperature.

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Cycloidal magnetic order in the compound IrMnSi

Cited by 26 publications

References 30 publications

Magnetic properties of selected Mn-based transition metal compounds withβ−Mnstructure: Experiments and theory

Magnetic properties of selected Mn-based transition metal compounds withβ−Mnstructure: Experiments and theory

Complex magnetic phase diagram of metamagnetic MnPtSi

Role of conduction electrons in mediating exchange interactions in Mn-based Heusler alloys

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