Half-Metallic Ferromagnets and Spin Gapless Semiconductors

Марченков, В. В.; Коуров, Н. И.; Irkhin, V. Yu.

doi:10.1134/s0031918x18130239

Cited by 27 publications

(16 citation statements)

References 23 publications

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“…For all alloys studied, the Hall coefficients were determined. In the case of ferromagnetic alloys, the normal R 0 and anomalous R S Hall coefficients were picked up taking into account [15] and using the expression (2) where M is the magnetization. The first term R 0 describes the normal Hall Effect associated with the action of the Lorentz force on the movement of conduction electrons in a magnetic field H. The second term is connected with spin-orbit interaction.…”

Section: Results On Magnetic and Transport Propertiesmentioning

confidence: 99%

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Peculiarities of Electronic Transport and Magnetic State in Half-Metallic Ferromagnetic and Spin Gapless Semiconducting Heusler Alloys

Марченков

Irkhin

Perevozchikova

2019

Phys. Metals Metallogr.

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A brief survey of experimental and theoretical studies of half-metallic ferromagnets (HMFs) and spin gapless semiconductors is given, the possible candidates being the X 2 YZ (X = Mn, Fe, Co; Y = Ti, V, Cr, Mn, Fe, Co, Ni; Z = Al, Si, Ga, Ge, In, Sn, Sb) Heusler alloys. The data on the electrical resistivity, normal and anomalous Hall Effect, and magnetic properties are presented. It is shown that the Co 2 FeZ alloys demonstrate properties of conventional ferromagnets, the HMF properties being also manifested at the variation of the Z-component. The Fe 2 YAl and Mn 2 YAl alloys show at the variation of the Y-component both metallic and semiconducting electronic characteristics, the magnetic properties, changing from the ferromagnetic to compensated ferrimagnetic state. The HMF and spin gapless semiconductor states are supposed to exist in these Heusler alloys systems.

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Section: Results On Magnetic and Transport Propertiesmentioning

confidence: 99%

“…The main feature of the electronic structure of HMFs is the presence of an energy gap at the Fermi level E F in one spin sub-band and a metallic character of the density of states N(E) in the other [1,2]. This can lead to 100% spin polarization of the charge carriers.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of Electronic Transport and Magnetic State in Half-Metallic Ferromagnetic and Spin Gapless Semiconducting Heusler Alloys

Марченков

Irkhin

Perevozchikova

2019

Phys. Metals Metallogr.

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“…The Heusler compounds family has more than 1500 alloys which exhibit various functional properties, i.e., magnetocaloric effect, 3,4 unusual thermal, 5,6 thermoelectric 7 and semiconductor [8][9][10] characteristics, properties of half-metallic ferromagnets 11,12,18 and spin gapless semiconductors. 13,14,19 The so-called full and inverse Heusler alloys are studied the most. These alloys have the same general formula X 2 YZ, where X and Y are 3d metals, and Z are s, p element, but a different crystal structure: L2 1 of the Cu 2 MnAl-type (full) and X a of the Hg 2 CuTi-type (inverse).…”

Section: Introductionmentioning

confidence: 99%

Magnetic and thermal properties of alloys close in composition to the spin gapless semiconductor Mn2CoAl

Семянникова

Коуров

Korolev

et al. 2021

Low Temperature Physics

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The field dependence of magnetization at T = 4.2 K and in magnetic fields of up to 70 kOe, temperature dependences of magnetization (2 K < T < 300 K), heat capacity (2 K < T < 30 K) and magnetic susceptibility (2 K < T < 1000 K) for Mn 1.99 Co 0.96 Al 1.05 and Mn 1.79 Co 1.25 Al 0.96 alloys, closed in composition to the Mn 2 CoAl spin gapless semiconductor, were studied. Alloys studied were demonstrated to be the band ferromagnets. Their high-field (H > 11 kOe) magnetization is described in the Stoner models with the Rhodes-Wohlfarth parameter p RW = 1.3 for Mn 1.99 Co 0.96 Al 1.05 and p RW = 2.3 for Mn 1.79 Co 1.25 Al 0.96 . When the composition deviates from the stoichiometric Mn 2 CoAl, the spontaneous moment decreases slightly, the effective moment, on the contrary, increases. In this case, a negative sign of the temperature-independent component of the paramagnetic susceptibility is observed. The density of states n(E F ) at Fermi level and the Debye temperature Θ D of studied alloys have the usual values for 3d-metal alloys.

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“…A special place in this series is occupied by Heusler alloys, which are in the state of a half-metal ferromagnet (HMF) [12][13][14][15] and a spin gapless semiconductor (SGS). [16][17][18][19] In the HMF state, an interesting feature is observed in the electronic energy spectrum near the Fermi level E F : for one spin direction (usually for the spin oriented against the direction of magnetization, i.e., spin "down"), there is a wide energy gap (∼ 1 eV) at E F , while for the opposite direction of spin (spin "up") the band gap is absent at E F . In SGS materials, there is a wide gap at E F for spin-down electrons and a zero gap for spin-up electrons (the valence and conduction bands are in a contact).…”

Section: Introductionmentioning

confidence: 99%

Features of the electroresistivity, magnetic and galvanomagnetic characteristics in Co2MeSi Heusler alloys

Марченков

Perevozchikova

Семянникова

et al. 2021

Low Temperature Physics

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The electro-and magneto-transport as well as magnetic properties of Co 2 MeSi (Me = Ti, V, Cr, Mn, Fe, Co, Ni) Heusler alloys were studied. The electroresistivity was measured from 4.2 to 300 K, the galvanomagnetic properties (magnetoresistivity and Hall effect) were measured at T = 4.2 K in magnetic fields of up to 100 kOe, and the magnetization at T = 4.2 and 300 K in fields of up to 70 kOe. The normal and anomalous Hall coefficients, saturation magnetization, residual resistivity, current carrier concentration, coefficients at linear contributions into the electroresistivity and magnetoresistivity were obtained. It was shown that on the one hand, there is quite clear correlation between the electronic and magnetic characteristics of Heusler alloys studied, and the spin polarization coefficients of current carriers, taken from well know literature data, on the other hand. The obtained results can be used for creation of new materials for spintronics.

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Half-Metallic Ferromagnets and Spin Gapless Semiconductors

Cited by 27 publications

References 23 publications

Peculiarities of Electronic Transport and Magnetic State in Half-Metallic Ferromagnetic and Spin Gapless Semiconducting Heusler Alloys

Peculiarities of Electronic Transport and Magnetic State in Half-Metallic Ferromagnetic and Spin Gapless Semiconducting Heusler Alloys

Magnetic and thermal properties of alloys close in composition to the spin gapless semiconductor Mn2CoAl

Features of the electroresistivity, magnetic and galvanomagnetic characteristics in Co2MeSi Heusler alloys

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