Composition dependence of magnetic properties in perpendicularly magnetized epitaxial thin films of Mn-Ga alloys

Mizukami, Shigemi; Kubota, Takahide; Wu, Feng; Zhang, X.; Miyazaki, T.; Naganuma, Hiroshi; Oogane, Mikihiko; Sakuma, Atsushi; Ando, Yumiko

doi:10.1103/physrevb.85.014416

Cited by 159 publications

(123 citation statements)

References 32 publications

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“…Such decrease of c with increasing y has also been observed in the bulk and thin film L1 0 -Mn y Ga alloys. 19,20 Although the excess Mn atoms are believed to occupy some of the Ga sites causing a change in the lattice constants, the exact arrangement of these atoms in the L1 0 lattice is not known. 15 For Rietveld refinement, we also assumed statistical fractional occupation of Mn atoms at the Ga sites.…”

Section: Resultsmentioning

confidence: 99%

Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures

Huh

Kharel

Shah

et al. 2013

Journal of Applied Physics

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Nanostructured Mn y Ga ribbons with varying Mn concentrations including Mn 1.2 Ga, Mn 1.4 Ga, Mn 1.6 Ga, and Mn 1.9 Ga were prepared using arc-melting and melt-spinning followed by a heat treatment. Our experimental investigation of the nanostructured ribbons shows that the material with y ¼ 1.2, 1.4, and 1.6 prefers the tetragonal L1 0 structure and that with y ¼ 1.9 prefers the D0 22 structure. We have found a maximum saturation magnetization of 621 emu/cm 3 in Mn 1.2 Ga which decreases monotonically to 300 emu/cm 3 as y reaches 1.9. Although both the L1 0 -and D0 22 -Mn y Ga samples show a high Curie temperature (T c ) well above room temperature, the value of T c decreases almost linearly from 702 K for Mn 1.9 Ga to 551 K for Mn 1.2 Ga. All the ribbons are metallic between 2 K and 300 K but the Mn 1.2 Ga also shows a resistance minimum near 15 K. The observed magnetic properties of the Mn y Ga ribbons are consistent with the competing ferromagnetic coupling between Mn moments in the regular L1 0 -MnGa lattice sites and antiferromagnetic coupling with excess Mn moments occupying Ga sites. V C 2013 AIP Publishing LLC. [http://dx

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Section: Resultsmentioning

confidence: 99%

Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures

Huh

Kharel

Shah

et al. 2013

Journal of Applied Physics

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“…Mn 3 Ga has been proposed as a compensated ferrimagnet having a high spin polarisation of 88%, hard magnetic properties, and a high Curie temperature T c (730 K) [3,4]. Epitaxial growth of Mn-Ga thin films with high PMA [5,2] and multilayer devices with high tunnelling magnetoresistance (TMR) [6,7,8,9] have been realised.…”

Section: Introductionmentioning

confidence: 99%

“…Beyond conventional perpendicular magnetic anisotropy (PMA) materials, tetragonal Mn-based Heusler alloys have recently opened up a new way to develop materials with high anisotropy [1,2]. Mn 3 Ga has been proposed as a compensated ferrimagnet having a high spin polarisation of 88%, hard magnetic properties, and a high Curie temperature T c (730 K) [3,4].…”

Section: Introductionmentioning

confidence: 99%

Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Ouardi¹,

Fecher²,

Kubota³

et al. 2015

J. Phys. D: Appl. Phys.

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Abstract.Using circularly polarised radiation and a combination of bulk-sensitive hard X-ray photoelectron spectroscopy and X-ray-absorption spectroscopy (XAS) we studied the electronic and magnetic structure of epitaxial Mn 1.8 Co 1.2 Ga thin films. Spin resolved Bloch spectral functions, density of states as well as charge and magnetisation densities were investigated by a first-principles analysis of full potential, fully relativistic Korringa-Kohn-Rostoker calculations of the electronic structure. The valence states were experimentally investigated by using linear dichroism in the angular distribution and comparing the results to spin-resolved densities of states. The linear dichroism in the valence band enabled a symmetry analysis of the contributing states. The spectra were in good agreement with the theoretical partial density of states. The element-specific, spin-resolved, unoccupied densities of states for Co and Mn were analysed by using XAS and X-ray magnetic circular dichroism (XMCD) at the L 3,2 edges. The spectra were influenced by strong correlation effects. XMCD was used to extract the site resolved magnetic moments. The experimental values of m Mn = 0.7 µ B and m Co = 1.05 µ B agree very well with the calculated magnetic moments. Magnetic circular dichroism in angle-resolved photoelectron spectroscopy at the Mn and Co 2p core level exhibited a pronounced magnetic dichroism and confirmed the localised character of the Mn d valence states.

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“…[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. 13 The tetragonal D0 22 -Mn 3 Ga intermetallic compound is not the most stable of these compounds.…”

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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Composition dependence of magnetic properties in perpendicularly magnetized epitaxial thin films of Mn-Ga alloys

Cited by 159 publications

References 32 publications

Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures

Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures

Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

High coercivity in Mn-Ga-Cu alloys

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Composition dependence of magnetic properties in perpendicularly magnetized epitaxial thin films of Mn-Ga alloys

Cited by 159 publications

References 32 publications

Magnetism and electron transport of MnyGa (1 &lt; y &lt; 2) nanostructures

Magnetism and electron transport of MnyGa (1 &lt; y &lt; 2) nanostructures

Magnetic dichroism study on Mn1.8Co1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

High coercivity in Mn-Ga-Cu alloys

Contact Info

Product

Resources

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Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures

Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures

Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy