CrO<sub>2</sub>-based heterostructure and magnetic tunnel junction: perfect spin filtering effect, spin diode effect and high tunnel magnetoresistance

Han, Jiangchao; Shen, Ji-Mei; Gao, Guoying

doi:10.1039/c8ra08107g

Cited by 15 publications

(5 citation statements)

References 45 publications

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“…For the past few years, due to the tremendous development of spintronic devices, half-metallic ferromagnets have attracted considerable attention. − Half-metallic ferromagnets are materials in which a metallic band crosses the Fermi level for one spin channel, while a band gap exists in the other spin channel. , Therefore, half-metallic ferromagnets should have 100% spin polarization at low temperatures and are an ideal material for use in spintronics equipment.…”

Section: Introductionmentioning

confidence: 99%

Structural, Magnetic, and Electronic Properties of the Cr_1–xTi_xO₂ Solid

Huang

Lin

et al. 2022

Inorg. Chem.

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Cr 1−x Ti x O 2 (0 ≤ x ≤ 1) solid solution was synthesized by a high-pressure and high-temperature method, whereafter systematic experimental and computational studies were conducted on the Cr 1−x Ti x O 2 system. The crystal structure of the samples where 0 ≤ x ≤ 0.4 and x = 1 was of a rutile structure (P4 2 /mnm), while samples where 0.5 ≤ x ≤ 0.9 crystallized in a CaCl 2 structure (Pnnm). The structural transformation from rutile-type to CaCl 2 -type structure should be due to the combined action of positive chemical pressure and physical pressure. The saturation magnetization of the Cr 1−x Ti x O 2 samples decreased linearly with the increase of x because Ti 4+ is nonmagnetic. In addition, the Curie temperature of the Cr 1−x Ti x O 2 samples also decreased noticeably with the increase of x. When nonmagnetic Ti 4+ randomly replaced Cr 4+ and occupied its position, the net exchange coupling in Cr 1−x Ti x O 2 would decrease. When Ti 4+ occupied the majority in the system, Cr 4+ ions would be separated by nonmagnetic Ti 4+ ions far enough for the long-range ferromagnetic order to weaken or even disappear with the increase of x, causing the Cr 1−x Ti x O 2 system to finally approach a paramagnetic state. Density functional theory calculations were performed for the Cr 1−x Ti x O 2 system, and the predicted trends of the magnetic properties agreed well with the experimental results. These calculations also showed that Cr 1−x Ti x O 2 was still half-metallic until x reached 0.6.

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Section: Introductionmentioning

confidence: 99%

Structural, Magnetic, and Electronic Properties of the Cr_1–xTi_xO₂ Solid

Huang

Lin

et al. 2022

Inorg. Chem.

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“…32-35. Nevertheless, all of the aforementioned MTJs are constructed using the CrO 2 bulk phase or films in the lateral heterostructure. [27][28][29][30][31][32][33][34][35] With respect to the lateral MTJs, materials with substantially different lattice structures or processing conditions cannot be epitaxially grown together without the generation of interface disorder. It could severely alter their intrinsic properties 36 and thus dramatically affect the TMR properties.…”

Section: Introductionmentioning

confidence: 99%

“…29–31 In the past three years, MoS 2 , TiO 2 , CNT and hydrogenated silicene were adopted as tunnel barriers in the CrO 2 based lateral MTJs, and the TMR ratio was reported to be up to 4.48 × 10 14 % in ref. 32–35.…”

Section: Introductionmentioning

confidence: 99%

Above-room Curie temperature and barrier-layer-dependent tunneling magnetoresistance in 1T-CrO₂ monolayer based magnetic tunnel junctions

Liu

Tang

Gan

et al. 2022

Phys. Chem. Chem. Phys.

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“…Among the two different spin channels of half-metallic ferromagnets, one spin channel is metallic, while the other is insulating or a semiconductor [11]. Half-metallic ferromagnets are widely used in spin diodes, spin valves, and spin filters because of their unique electronic structure [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

First Principles Study on the Effect of Pressure on the Structure, Elasticity, and Magnetic Properties of Cubic GaFe(CN)6 Prussian Blue Analogue

2019

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The structure, elasticity, and magnetic properties of Prussian blue analogue GaFe(CN)6 under external pressure ranges from 0 to 40 GPa were studied by first principles calculations. In the range of pressure from 0 to 35 GPa, GaFe(CN)6 not only has the half-metallic characteristics of 100% spin polarization, but also has stable mechanical properties. The external pressure has no obvious effect on the crystal structure and anisotropy of GaFe(CN)6, but when the pressure exceeds 35 GPa, the half-metallicity of GaFe(CN)6 disappears, the mechanical properties are no longer stable, and total magnetic moments per formula unit are no longer integer values.

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CrO₂-based heterostructure and magnetic tunnel junction: perfect spin filtering effect, spin diode effect and high tunnel magnetoresistance

Abstract: Spin-dependent device density of states in the CrO2/TiO2/CrO2 magnetic tunnel junction.

Cited by 15 publications

References 45 publications

Structural, Magnetic, and Electronic Properties of the Cr_1–xTi_xO₂ Solid

Structural, Magnetic, and Electronic Properties of the Cr_1–xTi_xO₂ Solid

Above-room Curie temperature and barrier-layer-dependent tunneling magnetoresistance in 1T-CrO₂ monolayer based magnetic tunnel junctions

First Principles Study on the Effect of Pressure on the Structure, Elasticity, and Magnetic Properties of Cubic GaFe(CN)6 Prussian Blue Analogue

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CrO2-based heterostructure and magnetic tunnel junction: perfect spin filtering effect, spin diode effect and high tunnel magnetoresistance

Abstract: Spin-dependent device density of states in the CrO2/TiO2/CrO2 magnetic tunnel junction.

Cited by 15 publications

References 45 publications

Structural, Magnetic, and Electronic Properties of the Cr1–xTixO2 Solid

Structural, Magnetic, and Electronic Properties of the Cr1–xTixO2 Solid

Above-room Curie temperature and barrier-layer-dependent tunneling magnetoresistance in 1T-CrO2 monolayer based magnetic tunnel junctions

First Principles Study on the Effect of Pressure on the Structure, Elasticity, and Magnetic Properties of Cubic GaFe(CN)6 Prussian Blue Analogue

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Product

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CrO₂-based heterostructure and magnetic tunnel junction: perfect spin filtering effect, spin diode effect and high tunnel magnetoresistance

Structural, Magnetic, and Electronic Properties of the Cr_1–xTi_xO₂ Solid

Structural, Magnetic, and Electronic Properties of the Cr_1–xTi_xO₂ Solid

Above-room Curie temperature and barrier-layer-dependent tunneling magnetoresistance in 1T-CrO₂ monolayer based magnetic tunnel junctions