Structural controlled magnetic anisotropy in Heusler L1−MnGa epitaxial thin films

Wang, Kangkang; E, Lu; Knepper, J. W.; Yang, Fengyuan; Smith, Arthur R.

doi:10.1063/1.3582244

Cited by 47 publications

(26 citation statements)

References 15 publications

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“…It was found that the crystalline orientation of the Ferromagnetic L1 0 -MnGa thin films, which epitaxially grown on GaN, sapphire, and MgO substrates, differ due to the influence of the substrate [32]. The in-plane and out-of-plane anisotropy is directly determined by the crystal orientation of the film and could be controlled via selection of the substrates.…”

Section: Introductionmentioning

confidence: 97%

“…Previous experimental results have shown that the Mn-Ga alloys grown on substrate or in superlattices have affected the tetragonality of the crystal structures, which is attributed to the lattice strain, and this has influence on the magnetic properties and the magnetocrystalline anisotropy of the alloys [18,[30][31][32][33][34][35][36]. It was found that the crystalline orientation of the Ferromagnetic L1 0 -MnGa thin films, which epitaxially grown on GaN, sapphire, and MgO substrates, differ due to the influence of the substrate [32].…”

Section: Introductionmentioning

confidence: 99%

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Strain control of magnetocrystalline anisotropy and energy product of MnGa alloys

Al-Aqtash

Sabirianov

2015

Journal of Magnetism and Magnetic Materials

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a b s t r a c tWe investigate the energy product of MnGa alloys as function of Mn concentration and applied elastic strain. Using the density functional theory (DFT) based method we calculated the magnetocrystalline anisotropy (MAE) and magnetization of Mn-Ga alloys as function of composition, e.g. Mn and Ga, and examined their variation under applied strain. Our calculations show that MAE is very large $ 22-27 M erg/cm 3 in all three considered compositions, e.g. MnGa, Mn 3 Ga and Mn 1.66 Ga. We show that MAE is very robust in MnGa system and remains large in wide range of concentrations and strains both compressive and tensile. We find that bi-axial tensile strain increases MAE in Mn 1.66 Ga alloys. Our study shows that the variation of MAE as function of Mn content is related to the change in electronic structure and, specifically, the Fermi level position with electron population variation. We estimated the theoretical limit of the energy product (BH) max of MnGa, Mn 3 Ga and Mn 1.66 Ga alloys as 23.65, 4.06 and 13.64 MGOe, respectively. We find that volume expansion of the MnGa alloys (by appropriate doping) should increase the magnetization and the energy product of these alloys.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Strain control of magnetocrystalline anisotropy and energy product of MnGa alloys

Al-Aqtash

Sabirianov

2015

Journal of Magnetism and Magnetic Materials

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“…An excellent candidate for satisfying these properties is MnGa alloys [2,3]. The structural, magnetic, and transport properties as well as spin polarization and magnetization dynamics of MnGa with PMA have been investigated in previous studies [4][5][6][7][8][9]. The new challenge concerning to MnGa alloys is increasing the tunnel magnetoresistance (TMR) ratio based on MgOMTJs.…”

Section: Introductionmentioning

confidence: 98%

Antiferromagnetic coupling in perpendicularly magnetized cubic and tetragonal Heusler bilayers

et al. 2015

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Epitaxial bilayer of tetragonal Heusler-like D0 22 -MnGa and cubic Heusler L2 1 -Co 2 MnSi have been successfully grown even for an unannealed sample. The interfacial exchange coupling (Jex) for samples annealed at different temperatures was evaluated from the magnetic hysteresis loop. Antiferromagnetic Jex was observed in the interfaces of cubic Heusler Co 2 MnSi and tetragonal D0 22 -MnGa layers. The evaluated Jex is -3.2 erg/cm 2 for a bilayer film annealed at 400 o C, being comparable to that for the FeCo/MnGa interface.

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“…The reported coercivities of L1 0 -MnGa films and powders are in the range of 2.2-6.2 kOe, which is not sufficiently high to qualify as a candidate for rare-earth-free magnets. [6][7][8][9][10][11] The D0 22 -Mn 3 Ga intermetallic compound, known as the Al 3 Ti-type MnGa phase, also has a tetragonal structure (I4/mmm). 12 Three different Mn 3 Ga intermetallic compounds are known to exits: the tetragonal D0 22 -Mn 3 Ga intermetallic compound, hexagonal D0 19 -Mn 3 Ga intermetallic compound, and cubic L2 1 -Mn 3 Ga intermetallic compound.…”

Section: Introductionmentioning

confidence: 99%

High coercivity in Mn-Ga-Cu alloys

Saito

Nishio–Hamane

2016

AIP Advances

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Mn-Ga-Cu alloys were produced by melt-spinning and subsequent annealing. The coercivity of the Mn-Ga-Cu alloys was dependent on the Cu content and the annealing conditions. The coercivity of the Mn65Ga20Cu15 alloy annealed at 573 K for 10 h, iHc = 23.8 kOe, was comparable to that of rare-earth-based magnets. The hard magnetic phase of the Mn65Ga20Cu15 alloy was found to be fine D022-Mn3Ga grains, formed from the fcc phase during annealing.

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Structural controlled magnetic anisotropy in Heusler L1−MnGa epitaxial thin films

Abstract: Epitaxial structure and magnetic anisotropies of metastable single crystal Co 0.70 Mn 0.30 film

Cited by 47 publications

References 15 publications

Strain control of magnetocrystalline anisotropy and energy product of MnGa alloys

Strain control of magnetocrystalline anisotropy and energy product of MnGa alloys

Antiferromagnetic coupling in perpendicularly magnetized cubic and tetragonal Heusler bilayers

High coercivity in Mn-Ga-Cu alloys

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