Structural and magnetic properties of CoIrMnAl equiatomic quaternary Heusler alloy epitaxial films designed using first-principles calculations

Monma, Ren; Roy, Tufan; Suzuki, Kazuya; Tsuchiya, Tomoyuki; Tsujikawa, Motokazu; Mizukami, Shigemi; Shirai, Masamitsu

doi:10.1016/j.jallcom.2021.159175

Cited by 6 publications

(4 citation statements)

References 55 publications

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“…From our previous study as well the present work, it can be conjectured that, in the case of the quaterneray Heusler alloy (XX ′ YZ), either X or X ′ should be a 5d element, to minimize the lattice mismatch with the MgO. However, the replacement of one Co of a traditional Co 2 -based Heusler alloy by Ir reduces the T C of the electrode, as we observed in the case of CoIrMnAl [15,16]. Note that the T C is one of the most important parameters to control the temperature dependence of the TMR ratio of a MTJ.…”

Section: Magnetic Propertiessupporting

confidence: 70%

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IrCrMnZ (Z = Al, Ga, Si, Ge) Heusler alloys as electrode materials for MgO-based magnetic tunneling junctions: a first-principles study

Roy¹,

Tsujikawa²,

Shirai³

2021

J. Phys. D: Appl. Phys.

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We study IrCrMnZ (Z=Al, Ga, Si, Ge) systems using first-principles calculations from the perspective of their application as the electrode materials of MgO-based MTJs. These materials have highly spin-polarized conduction electrons with partially occupied Δ1 band, which is important for coherent tunneling in parallel magnetization configuration. The Curie temperatures of IrCrMnAl and IrCrMnGa are very high (above 1300 K) as predicted from mean-field-approximation. The stability of ordered phase against various antisite disorders has been investigated. We discuss here the effect of ``spin-orbit-coupling'' on the electronic structure around Fermi level. Further, we investigate the electronic structure of IrCrMnZ/MgO heterojunction along (001) direction. IrCrMnAl/MgO and IrCrMnGa/MgO maintain half-metallicity even at the MgO interface, with no interfacial states at/around Fermi level in the minority-spin channel. Large majority-spin conductance of IrCrMnAl/MgO/IrCrMnAl and IrCrMnGa/MgO/IrCrMnGa is reported from the calculation of ballistic spin-transport property for parallel magnetization configuration. We propose IrCrMnAl/MgO/IrCrMnAl and IrCrMnGa/MgO/IrCrMnGa as promising MTJs with a weaker temperature dependence of tunneling magnetoresistance ratio, owing to their very high Curie temperatures.

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Section: Magnetic Propertiessupporting

confidence: 70%

“…Later on, we successfully fabricated a CoIrMnAl thin film. However, the Curie temperature (T C ) for CoIrMnAl is found to be somewhat in the moderate range (≈400 K) [16].…”

Section: Introductionmentioning

confidence: 97%

IrCrMnZ (Z = Al, Ga, Si, Ge) Heusler alloys as electrode materials for MgO-based magnetic tunneling junctions: a first-principles study

Roy¹,

Tsujikawa²,

Shirai³

2021

J. Phys. D: Appl. Phys.

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“…However, the replacement of one Co of traditional Co 2 -based Heusler alloy by Ir reduces the T C of the electrode as we observed in case of CoIrMnAl. [15,16] Note that T C is one of the most important parameters to control the temperature dependence of TMR ratio of a MTJ. So, along with minimizing the lattice mismatch at the MgO interface, by choosing 5d element (e.g.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…However, the Curie temperature (T C ) for CoIrMnAl is found to be somewhat in the moderate range (≈ 400 K). [16] Recently, there are significant amount of studies on the ferrimagnetic Heusler alloys both from the experiment and first-principles calculations from the perspective of the spintronics application. [17][18][19][20][21] Ferrimagnetic systems are of special interest in the spin transfer toque zation switching current.…”

Section: Introductionmentioning

confidence: 99%

IrCrMnZ (Z=Al, Ga, Si, Ge) Heusler alloys as electrode materials for MgO-based magnetic tunneling junctions: A first-principles study

Roy,

Tsujikawa,

Shirai

2021

Preprint

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We study IrCrMnZ (Z=Al, Ga, Si, Ge) systems using first-principles calculations from the perspective of their application as the electrode materials of MgO-based MTJs. These materials have highly spin-polarized conduction electrons with partially occupied ∆ 1 band, which is important for coherent tunneling in parallel magnetization configuration. The Curie temperatures of IrCrMnAl and IrCrMnGa are very high (above 1300 K) as predicted from mean-field-approximation. The stability of ordered phase against various antisite disorders has been investigated. We discuss here the effect of "spin-orbit-coupling" on the electronic structure around Fermi level. Further, we investigate the electronic structure of IrCrMnZ/MgO heterojunction along (001) direction. Ir-CrMnAl/MgO and IrCrMnGa/MgO maintain half-metallicity even at the MgO interface, with no interfacial states at/around Fermi level in the minority-spin channel. Large majority-spin conductance of IrCrMnAl/MgO/IrCrMnAl and IrCrMnGa/MgO/IrCrMnGa is reported from the calculation of ballistic spin-transport property for parallel magnetization configuration. We propose IrCrMnAl/MgO/IrCrMnAl and IrCrMnGa/MgO/IrCrMnGa as promising MTJs with a weaker temperature dependence of tunneling magnetoresistance ratio, owing to their very high Curie temperatures.

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Magnetic properties and possible martensitic transformation in equiatomic quaternary Heusler alloy CoMnNiSn

Shi

et al. 2022

Journal of Magnetism and Magnetic Materials

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Structural and magnetic properties of CoIrMnAl equiatomic quaternary Heusler alloy epitaxial films designed using first-principles calculations

Cited by 6 publications

References 55 publications

IrCrMnZ (Z = Al, Ga, Si, Ge) Heusler alloys as electrode materials for MgO-based magnetic tunneling junctions: a first-principles study

IrCrMnZ (Z = Al, Ga, Si, Ge) Heusler alloys as electrode materials for MgO-based magnetic tunneling junctions: a first-principles study

IrCrMnZ (Z=Al, Ga, Si, Ge) Heusler alloys as electrode materials for MgO-based magnetic tunneling junctions: A first-principles study

Magnetic properties and possible martensitic transformation in equiatomic quaternary Heusler alloy CoMnNiSn

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