Influence of plastic deformation on the magnetic properties of Heusler 
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Levin, Emily E.; Kitchaev, Daniil A.; Eggeler, Yolita M.; Mayer, Justin; Behera, Piush; Gianola, Daniel S.; Ven, Anton Van der; Pollock, Tresa M.; Seshadri, Ram

doi:10.1103/physrevmaterials.5.014408

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…Full Heusler compounds are identified by the elemental formula XY 2 Z, where X represents a post-transition metal, Y denotes a transition metal, and Z stands for a metalloid [1][2][3][4]. These compounds are well-known for possessing physical properties that render them suitable for diverse applications, including spintronic applications [5][6][7][8], superconductors [9,10], magnetocaloric [11][12][13][14][15], and shape-memory devices [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and magnetic properties of Si doped AlFe₂Ge full-Heusler

Kadim,

Masrour

2024

Phys. Scr.

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Using the spin-polarized GGA combined with TB-mBJ approach and Monte Carlo program, we methodically explore the electronic and magnetic features of cubic Al1-xSixFe2Ge (x = 0, 0.25, 0.50, 0.75, and 1) compounds. The structural optimization in ferromagnetic and ferrimagnetic state proves that alloy AlFe2Ge is ferrimagnetic with optimized lattice constant of 3.6075Å. The elastic constants and related mechanical quantities such as bulk modulus B, Zener anisotropy factor A and Cauchy pressure Cp were calculated. The calculated total magnetic moment shows a slightly decreasing in their values on increasing Si substitution x. The results show that the studied compound has remarkable properties such as their high magnetic entropy at low temperature 40 J.Kg-1.K-1, metallicity and ferrimagnetism. Noting that ferrimagnetic compound is more suitable for spintronic devices than its ferromagnetic compound because of its lower leakage fields and favorable robustness of magnetism.

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Section: Introductionmentioning

confidence: 99%

Electronic structure and magnetic properties of Si doped AlFe₂Ge full-Heusler

Kadim,

Masrour

2024

Phys. Scr.

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“…However, tuning the geometry and stability windows of these topological phases, at the synthesis stage or in situ, remains a challenge. This is due to the lack of a theoretical understanding of flexible material systems that are capable of hosting (anti)skyrmion phases at room temperature, as well as the irreversibility of the structural deformations typically necessary to elicit a substantial magnetic response [14,19]. An attractive model system for realizing chemicallyand mechanically-tunable (anti)skyrmion states are the tetragonal inverse Heusler alloys [15,16,20].…”

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confidence: 99%

Tuning magnetic antiskyrmion stability in tetragonal inverse Heusler alloys

Kitchaev¹,

Ven²

2021

Preprint

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The identification of materials supporting complex, tunable magnetic order at ambient temperatures is foundational to the development of new magnetic device architectures. We report the design of Mn2XY tetragonal inverse Heusler alloys that are capable of hosting magnetic antiskyrmions whose stability is sensitive to elastic strain. We first construct a universal magnetic Hamiltonian capturing the short-and long-range magnetic order which can be expected in these materials. This model reveals critical combinations of magnetic interactions that are necessary to approach a magnetic phase boundary, where the magnetic structure is highly susceptible to small perturbations such as elastic strain. We then computationally search for quaternary Mn2(X1, X2)Y alloys where these critical interactions may be realized and which are likely to be synthesizable in the inverse Heusler structure. We identify the Mn2Pt1−zXzGa family of materials with X = Au, Ir, Ni as an ideal system for accessing all possible magnetic phases, with several critical compositions where magnetic phase transitions may be actuated mechanically.

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“…The origin of such behavior, however, is still unknown. A recent TEM study on MnAu 2 Al Heusler alloy reports that the plastic deformation induced by the milling methods generates dislocations that lead to the occurrence of the low energy anti-phase boundaries (APBs) [88].…”

Section: C) Microstructurementioning

confidence: 99%

3D-printable composites for magnetic refrigeration based on Ni-Mn-In-Co shape memory alloys

Khanna

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Ni-Mn-Z (Z = In, Sn and Sb) Meta-Magnetic Shape Memory Alloys (MMSMA) have attracted considerable interest in past few decades due to their unique properties associated with a structural transformation called the Martensitic Transformation (MT) between a ferromagnetic austenite phase and weakly magnetic martensitic phase. As a result, a significant drop in magnetization takes place during the martensitic transformation. This feature allows the induction of the transformation by applying a magnetic field, leading to multi-functional properties such as giant magneto-resistance, magnetic shape memory effect, and large inverse magnetocaloric effect. These properties have practical applications in sensing and magnetic refrigeration. The transformation temperatures, magnetization of different phases, entropy change associated with the transformation, and other magneto-structural characteristics determining the functional properties depend on the composition, structure and microstructure of the alloys. While structure and composition (including atomic order) has been extensively analyzed, the role of microstructure has received less attention, despite its potential for controlling the magneto-structural properties. Therefore, this Ph.D. thesis is partially focused on examining the influence of microstructure in meta-magnetic shape memory alloys (specifically in Co-doped Ni-Mn-In) on the magneto-structural properties of micro-particles produced by milling. On the other side, the high MCE found in Ni-Mn-In-Co alloys, make them an attractive material for use in energy-efficient technologies. However, these alloys are very brittle and their use in commercial devices (heat exchanger for example) is limited to simple geometries. To overcome this issue, the present work demonstrates that the use of composites synthesized employing magnetic shape memory micro-particles (functionality) and polymers (geometrical integrity) could be an alternative in the future. The main goal is to be able to obtain microparticles with enhanced functional properties (sizes compatible with a standard 3D-printer nozzle) that can be embedded in a polymer matrix which results in a homogeneous 3D-printable magnetic composite. In this framework, thermo-mechanical treatments were employed (including hand-crushing, ball-milling and thermal annealing) to produce Ni45Co5Mn36.7In13.3 micro-particles. The influence of mechanical milling on the structural and magnetic properties (MT characteristics, crystallographic structures, saturation magnetization and magnetic susceptibility) and on the microstructural parameters such as the internal strains and crystallite sizes of micro-particles has been analyzed. The analysis was carried out in samples milled in both austenite and martensite and subjected to different milling times. A deeper understanding of the role played by the microstructure in the magneto-structural properties of these meta-magnetic shape memory alloys was achieved. For each milling time, the particles have been sieved into different size intervals and a comparative analysis of the magneto-structural and microstructural parameters of the particles within the same size range have been performed. The correlation between the degree of deformation and particle size opened new possibilities to enhance the functional properties of the alloys, where by mere selecting the particle size (irrespective of the duration, time and environment of milling), specific magneto-structural properties and transformation characteristics can be selected. The MCE and relative cooling power have been estimated in those particles suitable for been embedded into printable polymeric filaments. Finally, the fabrication of magnetic Polymer–MMSMA composites was carried out. The effect of the addition of the micro-particles onto the phase transformations and the thermal stability of the polymers has also been analyzed. Filaments were extruded from the composites with the higher particle concentration and mechanical consistency. The printability of these filaments was also demonstrated. As a proof of concept, a 3D printed heat exchanger for magnetic refrigeration was successfully produced using the developed filament.

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Influence of plastic deformation on the magnetic properties of Heusler MnAu2Al

Cited by 6 publications

References 43 publications

Electronic structure and magnetic properties of Si doped AlFe₂Ge full-Heusler

Electronic structure and magnetic properties of Si doped AlFe₂Ge full-Heusler

Tuning magnetic antiskyrmion stability in tetragonal inverse Heusler alloys

3D-printable composites for magnetic refrigeration based on Ni-Mn-In-Co shape memory alloys

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Influence of plastic deformation on the magnetic properties of Heusler MnAu2Al

Cited by 6 publications

References 43 publications

Electronic structure and magnetic properties of Si doped AlFe2Ge full-Heusler

Electronic structure and magnetic properties of Si doped AlFe2Ge full-Heusler

Tuning magnetic antiskyrmion stability in tetragonal inverse Heusler alloys

3D-printable composites for magnetic refrigeration based on Ni-Mn-In-Co shape memory alloys

Contact Info

Product

Resources

About

Electronic structure and magnetic properties of Si doped AlFe₂Ge full-Heusler

Electronic structure and magnetic properties of Si doped AlFe₂Ge full-Heusler