Effect of synthesis methods on magnetocaloric properties of Co-based Heusler-type alloys

Lee, A.Y.; Kim, S.Y.; Oh, Hyungsik; Kim, H.A.; Kim, Y.D.; Lee, M.H.

doi:10.1016/j.mseb.2018.10.005

Cited by 9 publications

(2 citation statements)

References 35 publications

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“…[ 15–18 ] Thanks to their extensive tunability [ 19–22 ] based on their chemical composition, crystal, or electronic structure, [ 23–29 ] they attract interest in the fundamental and application approach. [ 30–34 ] Particularly, spin polarization, [ 33,35 ] superconductivity, [ 36–39 ] shape memory, [ 40–45 ] or magnetocaloric behavior [ 28,40,46–50 ] have triggered significant interest in the experimental and theoretical perspective.…”

Section: Introductionmentioning

confidence: 99%

Heusler‐Based Cylindrical Micro‐ and Nanowires

Hennel

Varga

Frolova

et al. 2022

Physica Status Solidi (a)

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Heusler alloys present a large group of binary, [1][2][3][4][5] ternary, [6][7][8][9][10] or quaternary [11][12][13][14] compounds with a wide variety of physical properties. [15][16][17][18] Thanks to their extensive tunability [19][20][21][22] based on their chemical composition, crystal, or electronic structure, [23][24][25][26][27][28][29] they attract interest in the fundamental and application approach. [30][31][32][33][34] Particularly, spin polarization, [33,35] superconductivity, [36][37][38][39] shape memory, [40][41][42][43][44][45] or magnetocaloric behavior [28,40,[46][47][48][49][50] have triggered significant interest in the experimental and theoretical perspective.Based on the chemical composition and the resulting properties, Heusler alloys, also known as full-Heusler alloys with the stoichiometry X 2 YZ, can be divided into several groups according to their physical properties. [51] Co 2 YZ-based Heusler can be considered the leading group of materials showing high spin polarization (P) or even half metallicity (P ¼ 100%). [52][53][54][55][56][57] However, theoretical and experimental studies point to the high sensitivity of spin polarization on the structural disorder. [58] Here, the L2 1 crystalline phase exhibits the highest structural ordering, essential for achieving the required spin polarization values. [59] In contrast, while the mutual exchange of the atoms on the Y-Z position (B2 disorder) has a low influence on the spin polarization values, the X-Y or X-Y-Z disorders (D0 3 or A2, respectively) may significantly decrease spin polarization values. [55,60,61] The presented disadvantage can be solved by a suitable chemical composition or a proper method of preparation of Heusler alloys. [62,63] Stoichiometric and off-stoichiometric Ni-Mn-Z- [64][65][66] and Ni-Fe-Z-based Heusler alloys [67][68][69] are well-known magnetocaloric, shape memory, or even magnetic shape memory materials. [70,71] The mentioned Heusler alloys undergo a structural transformation from a low-temperature martensitic phase to a high-temperature austenitic phase, [51,[64][65][66][72][73][74] which may significantly influence the magnetic entropy change ΔS M and the intensity of the magnetocaloric effect. [75,76] Additionally, Heusler alloys consist of cheap elements like Ni, Fe, Mn, Co, Ga, and In, and thus may be considered low-cost counterparts for typical magnetocaloric material based on Gd, Rh, or other rare-earth elements. [77][78][79][80][81] Another advantage of the Ni-Mn-Zand Ni-Fe-Z-based Heusler alloys consists in the tunability of their structural and magnetic properties. Depending on the

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Section: Introductionmentioning

confidence: 99%

Heusler‐Based Cylindrical Micro‐ and Nanowires

Hennel

Varga

Frolova

et al. 2022

Physica Status Solidi (a)

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“…experimental point of view. Half metallic ferromagnetic Heusler alloys (HAs) are one of the most important families in the spintronics domain as they show multifunctional properties which makes them immensely popular for several decades of research; they can be shown to behave as half-metallic semiconductors, half-metallic ferrimagnets [1,2], non-magnetic semiconductors [3,4], topological insulators [5][6][7][8], antiferromagnetic half-metals [9,10], spin-gapless semiconductor [11,12], magnetocaloric materials [13][14][15], shape memory alloys [16,17] and thermoelectric materials [18][19][20][21] etc. The most obvious reason behind this versatility is the tunability of their electronic structure which subsequently changes their electrical and magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Study of structural, electronic and magnetic properties of Ti doped Co₂FeGe Heusler alloy: Co₂Fe_1−xTi_xGe (x = 0, 0.5, and 0.75)

Mitra¹,

Ahmad²,

Chakrabarti³

et al. 2021

J. Phys.: Condens. Matter

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Tunability of structural, magnetic and electronic properties of Co2FeGe Heusler alloy is experimentally demonstrated by doping Ti in the Fe site (i.e. Co2Fe1−x Ti x Ge), followed by in-depth first principle calculations. Co2FeGe in its pure phase shows very high saturation magnetization, Curie temperature and spin-wave stiffness constant which were reported in our earlier work. With gradual increase in Ti doping concentration (x = 0.5 and 0.75), the experimental saturation magnetization is found to be decreased to 4.3 μ B/f.u. and 3.1 μ B/f.u. respectively as compared to the parent alloy (x = 0) having the saturation magnetization of 6.1 μ B/f.u. Variation of spinwave stiffness constant is also studied for different x and found to be decreasing from peak value of 10.4 nm2 meV (for x = 0) to the least value of 2.56 nm2 meV for x = 0.5. Justification of the experimental results is given with first principle calculations. Computational phase diagram of the alloys is found in terms of formation energy showing that the doping in Fe site (i.e. Co2Fe1−x Ti x Ge) is more stable rather than in Co site (i.e. Co2−x FeTi x Ge). The change in magnetic moment and half-metallicity with Ti doping concentration is better explained under GGA + U approach as compared to GGA approach signifying that the electron–electron correlation (U) has a distinct role to play in the alloys. Effect of variation of U for Ti atom is studied and optimized with reference to the experimental results. The dynamical stability of the Co2Fe1−x Ti x Ge alloy crystal structure is explained in terms of phonon dispersion relations and the effect of U on the phonon density of states is also explored. Close agreement between the experimental and theoretical results is observed.

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Effect of Silica Sand on the Mechanical and Durability Characteristics of Concrete

Ghosh

Bose

Paul

et al. 2022

Lecture Notes in Civil Engineering

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Effect of synthesis methods on magnetocaloric properties of Co-based Heusler-type alloys

Cited by 9 publications

References 35 publications

Heusler‐Based Cylindrical Micro‐ and Nanowires

Heusler‐Based Cylindrical Micro‐ and Nanowires

Study of structural, electronic and magnetic properties of Ti doped Co₂FeGe Heusler alloy: Co₂Fe_1−xTi_xGe (x = 0, 0.5, and 0.75)

Effect of Silica Sand on the Mechanical and Durability Characteristics of Concrete

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Effect of synthesis methods on magnetocaloric properties of Co-based Heusler-type alloys

Cited by 9 publications

References 35 publications

Heusler‐Based Cylindrical Micro‐ and Nanowires

Heusler‐Based Cylindrical Micro‐ and Nanowires

Study of structural, electronic and magnetic properties of Ti doped Co2FeGe Heusler alloy: Co2Fe1−x Ti x Ge (x = 0, 0.5, and 0.75)

Effect of Silica Sand on the Mechanical and Durability Characteristics of Concrete

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Study of structural, electronic and magnetic properties of Ti doped Co₂FeGe Heusler alloy: Co₂Fe_1−xTi_xGe (x = 0, 0.5, and 0.75)