Volume effects on microstructures and magnetic properties of MnGa thin films during order-disorder transformation

Chang, Cheng-Wei; Sun, Andy; Chiu, Po-Kai; Wang, Sea-Fue

doi:10.1016/j.vacuum.2022.111068

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…The D0 22 phase has low saturation magnetization (M s ∼ 43 emu g −1 ) due to the antiparallel arrangement of magnetic moments in ferrimagnetic ordering. However, with high T C (∼762 K), large K u (∼2 MJ m −3 ) and relative high maximum energy product (BH) max (∼28 MGOe) [18,29] of this phase, Mn-Ga alloys can be widely used in magnetoelectronic devices [30][31][32][33][34]. The creation of this desired phases strongly depends on composition and fabrication conditions of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of melt-spun Mn-Ga-Cu-Al ribbons

Pham

Nguyen

Lam

et al. 2023

Mater. Res. Express

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In this work, we investigated structure and magnetic properties of Mn65Ga20Al15-xCux (x = 0, 5, 10 and 15) alloy ribbons prepared by melt-spinning method combined with annealing. The annealing temperature was varied from 250°C to 350°C, and the annealing time was changed from 5 h to 20 h. Concentration of Cu and annealing process significantly influence on the formation of the desired phases in the alloy ribbons. The D022-type Mn3Ga crystalline phase with the hexagonal structure, which characterizes hard magnetic property of Mn-Ga based alloys, is enhanced after an appropriate annealing process. The change of grain size after annealing also contributes to the increased coercivity of the alloy ribbons. The highest coercivity of 12.9 kOe and saturation magnetization of 18.7 emu/g are achieved on the alloy ribbons with Cu concentration of 10%. The simultaneous enhancement of these magnetic parameters has an important significance for application possibility of the Mn-Ga based alloys.

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Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of melt-spun Mn-Ga-Cu-Al ribbons

Pham

Nguyen

Lam

et al. 2023

Mater. Res. Express

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Regulating interfacial exchange coupling in perpendicular magnetized Fe/DO22-Mn3Ga bilayer films

Yu,

Sun,

Chu

et al. 2024

Vacuum

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High Magnetic Performance in MnGa Nanocomposite Magnets

Crisan,

Crisan

2024

Nanomaterials

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In view of their potential applicability in technology fields where magnets are required to operate at higher temperatures, the class of nanocomposite magnets with little or no rare earth (RE) content has been widely researched in the last two decades. Among these nanocomposite magnets, the subclass of magnetic binary systems exhibiting the formation of L10 tetragonal phases is the most illustrious. Some of the most interesting systems are represented by the Mn-based alloys, with addition of Al, Bi, Ga, Ge. Such alloys are interesting as they are less costly than RE magnets and they show promising magnetic properties. The paper tackles the case of MnGa binary alloys with various compositions around the Mn3Ga stoichiometry. Four MnGa magnetic alloys, with Mn content ranging from 70 at% to 75 at% were produced using rapid solidification to form the melt. By combining structural information arising from X-ray diffractometry and transmission electron microscopy with magnetic properties determined by vibrating sample magnetometry, we are able to document the nature and properties of the structural phases formed in the alloys in their as-cast state and upon annealing, the evolution of the phase structure after annealing and its influence on the magnetic behavior of the MnGa alloys. After annealing at 400 °C and 500 °C, MnGa alloys are showing a multiple-phase microstructure, consisting of co-existing crystallites of L10 and D022 tetragonal phase. As a consequence of these structurally and magnetically different phases, co-existing within the microstructure, promising magnetic features are obtained, with both coercive fields and saturation magnetization exceeding values previously reported for both alloys and layers of MnGa.

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Volume effects on microstructures and magnetic properties of MnGa thin films during order-disorder transformation

Cited by 3 publications

References 35 publications

Structure and magnetic properties of melt-spun Mn-Ga-Cu-Al ribbons

Structure and magnetic properties of melt-spun Mn-Ga-Cu-Al ribbons

Regulating interfacial exchange coupling in perpendicular magnetized Fe/DO22-Mn3Ga bilayer films

High Magnetic Performance in MnGa Nanocomposite Magnets

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