Structure magnétique des MnCoSi

Nizioł, S.; Binczycka, H.; Szytuła, A.; Todorović, Jelena; Fruchart, R.; Sénateur, J.P.; Fruchart, D.

doi:10.1002/pssa.2210450231

Cited by 58 publications

(35 citation statements)

References 7 publications

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“…A first method to tune the metamagnetic transition is to explore the for the magnetic properties of MnM'X compounds. 22,23,27,28 Moreover, it has recently been suggested that this parameter plays the dominant role in determining the magnetic properties of these compounds. 21 (ii) The T N is driven towards higher temperatures either by increasing the Fe/Co ratio or the Mn/(Fe,Co) ratio.…”

Section: B Tuning Of the Af-fm Transitionmentioning

confidence: 99%

Tuning the metamagnetic transition in the (Co, Fe)MnP system for magnetocaloric purposes

Guillou

Brück

2013

Journal of Applied Physics

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The inverse magnetocaloric effect taking place at the antiferro-to-ferromagnetic transition of (Co,Fe)MnP phosphides has been characterised by magnetic and direct ΔT ad measurements. In Co 0.53 Fe 0.47 MnP, entropy change of 1.5 Jkg -1 K -1 and adiabatic temperature change of 0.6 K are found at room temperature for an intermediate field change (∆B= 1 T). Several methods were used to control the metamagnetic transition properties, in each case a peculiar splitting of the antiferro-to-ferromagnetic transition is observed.

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Section: B Tuning Of the Af-fm Transitionmentioning

confidence: 99%

Tuning the metamagnetic transition in the (Co, Fe)MnP system for magnetocaloric purposes

Guillou

Brück

2013

Journal of Applied Physics

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“…Apart from a SOMT from a ferromagnetic state to a paramagnetic state at 390K in MnCoSi, there is another first-order metamagnetic transition induced by temperature or field from a low-temperature helical antiferromagnetic (AFM) state to a high-temperature high magnetization state or ferromagnetic (FM) state [8][9][10]. It was reported that the metamagnetic transition is highly sensitive to field and produces a large negative magnetocaloric effect [8,10].…”

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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“…Here we study two differently prepared samples of CoMnSi, an inverse 13 magnetocaloric material that exhibits an antiferromagnetic (AFM) to ferromagnetic (FM) field-driven phase transition. 14,15,16 The high sensitivity of first order magnetocaloric materials to strain is a potentially useful tool for tuning the magnetocaloric effect. In the particular case of CoMnSi the sensitivity of magnetism to strain is due to the known high magneto-elastic interaction.…”

Section: Introductionmentioning

confidence: 99%

“…14,16,19 By allowing the sample to cool slowly at a rate of approximately 0.2K/min, the change from high temperature hexagonal phase to low temperature orthorhombic phase (T orth-hex~1 200K) 15 is completed and the system equilibrates to its lowest energy state. In contrast rapid cooling by quenching leaves the material in an 4 unrelaxed strained state with a degree of lattice distortion.…”

Section: Introductionmentioning

confidence: 99%

The magnetocaloric performance in pure and mixed magnetic phase CoMnSi

Morrison¹,

Barcza²,

Moore³

et al. 2010

J. Phys. D: Appl. Phys.

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Here we study the influence of sample preparation on the magnetocaloric properties of CoMnSi. Slow cooling from the high temperature hexagonal phase of the melt to the room temperature orthorhombic phase encourages the formation of a homogeneous material with large entropy changes when the system undergoes a coincident first order structural and (meta)magnetic transition. Samples that were quenched directly after annealing show a compressed a axis lattice parameter. Hall probe imaging indicates that the quenched sample has spatially inhomogeneous magnetic properties, which we attribute to strain because within error neither x-ray diffraction nor energy dispersive x-ray analysis indicates a second compositional phase. Calorimetric methods and global magnetization are used to examine the entropy changes of the pure and mixed magnetic phase compounds and we make a direct comparison of these materials in terms of their refrigerant capacity.

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Structure magnétique des MnCoSi

Cited by 58 publications

References 7 publications

Tuning the metamagnetic transition in the (Co, Fe)MnP system for magnetocaloric purposes

Tuning the metamagnetic transition in the (Co, Fe)MnP system for magnetocaloric purposes

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

The magnetocaloric performance in pure and mixed magnetic phase CoMnSi

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Structure magnétique des MnCoSi

Cited by 58 publications

References 7 publications

Tuning the metamagnetic transition in the (Co, Fe)MnP system for magnetocaloric purposes

Tuning the metamagnetic transition in the (Co, Fe)MnP system for magnetocaloric purposes

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

The magnetocaloric performance in pure and mixed magnetic phase CoMnSi

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