Beitrag zum Ferromagnetismus von Legierungen der Übergangsmetalle mit Elementen der B-Gruppe

Castelliz, L.

doi:10.1515/ijmr-1955-460308

Cited by 9 publications

(8 citation statements)

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“…This situation is very different from that in Heusler compounds, where usually dT C /d p > 0 is found. However, it is in agreement with Castelliz's [49] and Kanomata's [50] empirical interaction curves. They propose a negative pressure coefficient of T C for short Mn-Mn distances as in hexagonal MnAs or MnSb, but a positive coefficient at larger distances as in the Heusler compounds X 2 MnZ.…”

Section: Exchange Interactions and Curie Temperaturessupporting

confidence: 86%

Exchange interactions and Curie temperatures of Mn₂CoZ compounds

Meinert

Schmalhorst

Reiss

2011

J. Phys.: Condens. Matter

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The generalized Heusler compounds Mn(2)CoZ (Z = Al, Ga, In, Si, Ge, Sn, Sb) with the Hg(2)CuTi structure are of great interest due to their half-metallic ferrimagnetism. The complex magnetic interactions between the constituents are studied by means of first principles calculations of the Heisenberg exchange coupling parameters, and Curie temperatures are calculated from those. Due to the direct Mn-Mn exchange interaction in Mn(2)CoZ, the Curie temperature decreases, although the total moment increases when the valence electron number Z is increased. The exchange interactions are dominated by a strong direct exchange between Co and its nearest neighbor Mn on the B site, which is nearly constant. The coupling between the nearest neighbor Mn atoms scales with the magnetic moment of the Mn atom on the C site. Calculations with different lattice parameters suggest a negative pressure dependence of the Curie temperature, which follows from the decreasing magnetic moments. Curie temperatures of more than 800 K are predicted for Mn(2)CoAl (890 K), Mn(2)CoGa (886 K), and Mn(2)CoIn (845 K).

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Section: Exchange Interactions and Curie Temperaturessupporting

confidence: 86%

Exchange interactions and Curie temperatures of Mn₂CoZ compounds

Meinert

Schmalhorst

Reiss

2011

J. Phys.: Condens. Matter

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“…For the present crystal structure, with 264 atoms per unit cell, the computational cost can be significant. At the gross level, it is possible to relate Mn 1.05 Rh 0.02 Bi with the other Mnbased materials following the empirical interaction curve from Castelliz [40]. Such a curve is shown in Fig.…”

Section: B Magnetic Propertiesmentioning

confidence: 99%

Structural and Ferromagnetic Properties of an Orthorhombic Phase of MnBi Stabilized with Rh Additions

et al. 2015

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The article addresses the possibility of alloy elements in MnBi which may modify the thermodynamic stability of the NiAs-type structure without significantly degrading the magnetic properties. The addition of small amounts of Rh and Mn provides an improvement in the thermal stability with some degradation of the magnetic properties. The small amounts of Rh and Mn additions in MnBi stabilize an orthorhombic phase whose structural and magnetic properties are closely related to the ones of the previously reported high-temperature phase of MnBi (HT MnBi). To date, the properties of the HT MnBi, which is stable between 613 and 719 K, have not been studied in detail because of its transformation to the stable low-temperature MnBi (LT MnBi), making measurements near and below its Curie temperature difficult. The Rh-stabilized MnBi with chemical formula Mn1.0625−xRhxBi [x = 0.02(1)] adopts a new superstructure of the NiAs/Ni2In structure family. It is ferromagnetic below a Curie temperature of 416 K. The critical exponents of the ferromagnetic transition are not of the mean-field type but are closer to those associated with the Ising model in three dimensions. The magnetic anisotropy is uniaxial; the anisotropy energy is rather large, and it does not increase when raising the temperature, contrary to what happens in LT MnBi. The saturation magnetization is approximately 3 µB/f.u. at low temperatures. While this exact composition may not be application ready, it does show that alloying is a viable route to modifying the stability of this class of rare-earth-free magnet alloys.

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“…Co 2 MnSn Heusler alloy attracts attention because it is a ferromagnet with a high Curie temperature (T c ∼ 830 K) [8]. The neutron diffraction measurement by Webster showed that Co 2 MnSn has a net moment of 5.08 µ B per formula and individual moments of ∼3.58 µ B and ∼0.75 µ B per Mn and Co atom, respectively [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of substitution of Mn with Fe or Cr in Heusler alloy of Co₂MnSn

Zhang

Jiko

Mibu

et al. 2005

J. Phys.: Condens. Matter

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Crystallographic and magnetic properties of Co 2 Mn 1−x Fe x Sn and Co 2 Mn 1−y Cr y Sn Heusler alloys were studied using x-ray diffraction, scanning electron microscopy with energy dispersive x-ray analysis, magnetization measurements and Mössbauer spectroscopy. We found that the intermetallic compounds crystallize into a single phase with the L2 1 -type Heusler structure at the concentration of 0 x 0.5 for Co 2 Mn 1−x Fe x Sn and 0 y 0.3 for Co 2 Mn 1−y Cr y Sn. The spontaneous magnetization increases when Mn is substituted with Fe and decreases when Mn is substituted with Cr. The values of hyperfine field at the Sn nuclear sites in Co 2 Mn 1−x Fe x Sn and Co 2 Mn 1−y Cr y Sn also increase or decrease in combination with the size of magnetization. These measurements suggest that the Slater-Pauling behaviour in half-metallic full-Heusler alloys provides a good description of the substitution effect of Mn with Fe or Cr.

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Beitrag zum Ferromagnetismus von Legierungen der Übergangsmetalle mit Elementen der B-Gruppe

Cited by 9 publications

References 0 publications

Exchange interactions and Curie temperatures of Mn₂CoZ compounds

Exchange interactions and Curie temperatures of Mn₂CoZ compounds

Structural and Ferromagnetic Properties of an Orthorhombic Phase of MnBi Stabilized with Rh Additions

Effect of substitution of Mn with Fe or Cr in Heusler alloy of Co₂MnSn

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Beitrag zum Ferromagnetismus von Legierungen der Übergangsmetalle mit Elementen der B-Gruppe

Cited by 9 publications

References 0 publications

Exchange interactions and Curie temperatures of Mn2CoZ compounds

Exchange interactions and Curie temperatures of Mn2CoZ compounds

Structural and Ferromagnetic Properties of an Orthorhombic Phase of MnBi Stabilized with Rh Additions

Effect of substitution of Mn with Fe or Cr in Heusler alloy of Co2MnSn

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Exchange interactions and Curie temperatures of Mn₂CoZ compounds

Exchange interactions and Curie temperatures of Mn₂CoZ compounds

Effect of substitution of Mn with Fe or Cr in Heusler alloy of Co₂MnSn