Metamagnetism of CoMnSi

Binczycka, H.; Szytuła, A.; Todorović, Jelena; Zaleski, T. A.; Zięba, Andrzej

doi:10.1002/pssa.2210350161

Cited by 28 publications

(18 citation statements)

References 4 publications

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“…IrMnSi was found to crystallize with the TiNiSi type structure, and it is thus isostructural with the roomtemperature polymorph of, e.g., RhMnSi, 14 CoMnSi, 11,12 CoMnGe, 9 NiMnSi, 10 and NiMnGe. 13,25 For CoMn͑Si/ Ge͒ and NiMn͑Si/ Ge͒ a transition to the Ni 2 In-type structure is reported to take place at higher temperatures ͑between 125 and 930°C͒.…”

Section: Discussionmentioning

confidence: 99%

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Cycloidal magnetic order in the compound IrMnSi

et al. 2005

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A new compound, IrMnSi, has been synthesized, and its crystal structure and magnetic properties have been investigated by means of neutron powder diffraction, magnetization measurements, and first-principles theory. The crystal structure is found to be of the TiNiSi type ͑ordered Co 2 P, space group Pnma͒. The Mn-projected electronic states are situated at the Fermi level, giving rise to metallic binding, whereas a certain degree of covalent character is observed for the chemical bond between the Ir and Si atoms. A cycloidal, i.e., noncollinear, magnetic structure was observed below 460 K, with the propagation vector q = ͓0,0,0.4530͑5͔͒ at 10 K. The magnetism is dominated by large moments on the Mn sites, 3.8 B / atom from neutron diffraction. First-principles theory reproduces the propagation vector of the experimental magnetic structure as well as the angles between the Mn moments. The calculations further result in a magnetic moment of 3.2 B for the Mn atoms, whereas the Ir and Si moments are negligible, in agreement with observations. A calculation that more directly incorporates electron-electron interactions improves the agreement between the theoretical and experimental magnetic moments. A band mechanism is suggested to explain the observed magnetic order.

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Section: Discussionmentioning

confidence: 99%

“…Among the isostructural TiNiSi-type compounds ͑ordered Co 2 P͒, 8 CoMnGe, 9 NiMnSi, 10 and CoMnSi ͑in the temperature interval 360-390 K͒ 11,12 are ferromagnetic and CoMnSi ͑T Ͻ 360 K͒ 11 and NiMnGe ͑Ref. 13͒ form helicoidal magnetic structures, whereas NiMnSi 0.5 Ge 0.5 ͑Ref.…”

Section: Introductionmentioning

confidence: 99%

Cycloidal magnetic order in the compound IrMnSi

et al. 2005

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“…The Néel temperature ( N M ) of martensite is around 400 K [13][14][15]. Below N M , the martensite phase has a special double helical magnetic structure and shows a competition between the antiferromagnetic (AFM) and ferromagnetic (FM) couplings [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…According to the previous neutron diffraction studies [16], the exchange interactions between Mn-Mn and Mn-Co atoms are complicated with FM and AFM couplings coexisting in the system. Temperature [14,15], pressure [13,17], and magnetic field [14,18] can drive a first-order transition from an AFM to an FM state in MnCoSi-based compounds. Chemical composition change by substituting Ni for Co [19,20] or Ge for Si [18,21,22] in MnCoSi can also convert the AFM martensite to FM one.…”

Section: Introductionmentioning

confidence: 99%

Structural and magnetic properties of MnCo 1−x Fe x Si alloys

Chen

Wei

(刘恩克)

et al. 2015

Journal of Magnetism and Magnetic Materials

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Abstract:The crystal structures, martensitic structural transitions and magnetic properties of MnCo 1-x Fe x Si (0 ≤ x ≤ 0.50) alloys were studied by differential scanning calorimetry (DSC), x-ray powder diffraction (XRD) and magnetic measurements. In high-temperature paramagnetic state, the alloys undergo a martensitic structural transitions from the Ni 2 In-type hexagonal parent phase to the TiNiSi-type

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“…It was reported that the metamagnetic transition is highly sensitive to field and produces a large negative magnetocaloric effect [8,10]. In addition, a slight substitution of Ge for Si lowers the metamagnetic transition temperature and the critical field but doesn't improve the magnitude of the peak MCE entropy [10].…”

Section: Introductionmentioning

confidence: 99%

Wide temperature span of entropy change in first-order metamagnetic MnCo_1−xFe_xSi

Xu¹,

Yang²,

Du³

et al. 2014

J. Phys. D: Appl. Phys.

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Abstract. The crystal structure and magnetic properties of MnCo x Fe 1-x Si (x=0-0.5) compounds were investigated. With increasing Fe content, the unit cell changes anisotropically and the magnetic property evolves gradually: Curie temperature decreases continuously, the first-order metamagnetic transition from a low-temperature helical antiferromagnetic state to a high-temperature ferromagnetic state disappears gradually and then a spin-glass-like state and another antiferromagnetic state emerge in the low temperature region. The Curie transition leads to a moderate conventional entropy change. The metamagnetic transition not only yields a larger negative magnetocaloric effect at lower applied fields than in MnCoSi but also produces a very large temperature span (103 K for Δμ 0 H=5 T) of ∆ (T) , which results in a large refrigerant capacity. These phenomena were explained in terms of crystal structure change and magnetoelastic coupling mechanism. The low-cost MnCo 1-x Fe x Si compounds are promising candidates for near room temperature magnetic refrigeration applications because of the large isothermal entropy change and the wide working temperature span. PACS number(s): 75.30.Sg, 75.30.Kz IntroductionRecently, room-temperature magnetic refrigeration based on the magnetocaloric effect (MCE) has emerged as a competitive technology to gas compress for it is energy efficient and also environmentally friendly. Up to date, there are several candidate materials for magnetic refrigeration and according to the nature of the magnetic transition, they fall into two categories: first-order magnetic transition (FOMT) materials and second-order magnetic

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Metamagnetism of CoMnSi

Cited by 28 publications

References 4 publications

Cycloidal magnetic order in the compound IrMnSi

Cycloidal magnetic order in the compound IrMnSi

Structural and magnetic properties of MnCo 1−x Fe x Si alloys

Wide temperature span of entropy change in first-order metamagnetic MnCo_1−xFe_xSi

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Metamagnetism of CoMnSi

Cited by 28 publications

References 4 publications

Cycloidal magnetic order in the compound IrMnSi

Cycloidal magnetic order in the compound IrMnSi

Structural and magnetic properties of MnCo 1−x Fe x Si alloys

Wide temperature span of entropy change in first-order metamagnetic MnCo1−xFexSi

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Wide temperature span of entropy change in first-order metamagnetic MnCo_1−xFe_xSi