scholarly journals Strain Control of the Tunable Physical Nature of a Newly Designed Quaternary Spintronic Heusler Compound ScFeRhP

2018 ◽  
Vol 8 (9) ◽  
pp. 1581 ◽  
Author(s):  
Zongbin Chen ◽  
Habib Rozale ◽  
Yongchun Gao ◽  
Heju Xu
Keyword(s):  
Rare Earth ◽  
Magnetic Semiconductors ◽  
Magnetic Semiconductor ◽  
Physical Nature ◽  
First Principle ◽  
Half Metals ◽  
Equilibrium Lattice Constant ◽  
Quaternary Compounds ◽  
Structure Density ◽  
Spin Gapless Semiconductors

Recently, an increasing number of rare-earth-based equiatomic quaternary compounds have been reported as promising novel spintronic materials. The rare-earth-based equiatomic quaternary compounds can be magnetic semiconductors (MSs), spin-gapless semiconductors (SGSs), and half-metals (HMs). Using first-principle calculations, we investigated the crystal structure, density of states, band structure, and magnetic properties of a new rare-earth-based equiatomic quaternary Heusler (EQH) compound, ScFeRhP. The results demonstrated that ScFeRhP is a HM at its equilibrium lattice constant, with a total magnetic moment per unit cell of 1 μB. Furthermore, upon introduction of a uniform strain, the physical state of this compound changes with the following transitions: non-magnetic-semiconductor-(NMS) → MS → SGS → HM → metal. We believe that these results will inspire further studies on other rare-earth-based EQH compounds for spintronic applications.

scholarly journals Rare earth-based quaternary Heusler compoundsMCoVZ(M= Lu, Y;Z= Si, Ge) with tunable band characteristics for potential spintronic applications

IUCrJ ◽  
2017 ◽  
Vol 4 (6) ◽  
pp. 758-768 ◽  
Author(s):  
Xiaotian Wang ◽  
Zhenxiang Cheng ◽  
Guodong Liu ◽  
Xuefang Dai ◽  
Rabah Khenata ◽  
...  
Keyword(s):  
Rare Earth ◽  
Magnetic Semiconductors ◽  
Magnetic Moments ◽  
Electronic Devices ◽  
Spin Filter ◽  
Lattice Constants ◽  
Half Metals ◽  
Different Types ◽  
Points Of View ◽  
Spin Gapless Semiconductors

Magnetic Heusler compounds (MHCs) have recently attracted great attention since these types of material provide novel functionalities in spintronic and magneto-electronic devices. Among the MHCs, some compounds have been predicted to be spin-filter semiconductors [also called magnetic semiconductors (MSs)], spin-gapless semiconductors (SGSs) or half-metals (HMs). In this work, by means of first-principles calculations, it is demonstrated that rare earth-based equiatomic quaternary Heusler (EQH) compounds with the formulaMCoVZ(M= Lu, Y;Z= Si, Ge) are new spin-filter semiconductors with total magnetic moments of 3 µB. Furthermore, under uniform strain, there are physical transitions from spin-filter semiconductor (MS) → SGS → HM for EQH compounds with the formula LuCoVZ, and from HM → SGS → MS → SGS → HM for EQH compounds with the formula YCoVZ. Remarkably, for YCoVZEQH compounds there are not only diverse physical transitions, but also different types of spin-gapless feature that can be observed with changing lattice constants. The structural stability of these four EQH compounds is also examined from the points of view of formation energy, cohesive energy and mechanical behaviour. This work is likely to inspire consideration of rare earth-based EQH compounds for application in future spintronic and magneto-electronic devices.

Effect of Low Temperature Annealing on High Field Magnetoresistance and Hall effect in (Ga, Mn)As Dilute Magnetic Semiconductors

2004 ◽  
Vol 831 ◽  
Author(s):  
K. Ghosh ◽  
Mohammad Arif ◽  
T. Kehl ◽  
R. J. Patel ◽  
S. R. Mishra ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Low Temperature ◽  
High Field ◽  
Magnetic Semiconductors ◽  
Magnetic Semiconductor ◽  
Dilute Magnetic Semiconductors ◽  
Epitaxial Thin Films ◽  
Ferromagnetic Transition ◽  
Optimal Temperature ◽  
Low Temperature Annealing

ABSTRACTIn this paper we report the effect of low temperature annealing on the high field magnetotransport properties of epitaxial thin films of (Ga, Mn)As Dilute Magnetic Semiconductor (DMS) with low concentration (1.5 %) of Mn doping, which results in a ferromagnetic insulator. Annealing at an optimal temperature enhances the conductivity, carrier concentration, and ferromagnetic transition temperature. The field dependence of magnetoresistance is different below and above the ferromagnetic transition temperature. An attempt is made to analyze the data using a theoretical model proposed by Kaminski and Das Sarma [1].

Magnetic Properties of New Diluted Magnetic Semiconductors Pb1-X-YMgXYbYTe

2010 ◽  
Vol 168-169 ◽  
pp. 376-379
Author(s):  
E.A. Zvereva ◽  
O.A. Savelieva ◽  
S. Ibragimov ◽  
Y. Titov ◽  
E.I. Slynko ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Magnetic Moment ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Electron Shell ◽  
Interaction Constant ◽  
Paramagnetic Resonance ◽  
Diluted Magnetic

We have studied the magnetic susceptibility, magnetization and electron paramagnetic resonance (EPR) in the diluted magnetic semiconductor Pb1-x-yMgxYbyTe. The magnetic susceptibility of this system is a superposition of the matrix diamagnetism, the paramagnetic contribution of electrons localized in the ytterbium band, and the Curie-Weiss paramagnetism provided by Yb3+ ions. The concentration of Yb3+ ions monotonically increases with the ytterbium content, while a significant fraction of ytterbium ions remains in a nonmagnetic Yb2+ state. A pronounced hyperfine structure was revealed in the EPR spectra. It was ascribed to the interaction between the electron magnetic moment of an unfilled electron shell of Yb3+ ions and nuclear magnetic moment of the 173Yb isotope. The estimated values of the effective g-factor (g1.997 0.002) and the hyperfine-interaction constant (173A=0,56 cm-1) were found to be almost independent of both alloy composition and temperature.

First principle studies of structural, magnetic and elastic properties of orthorhombic rare-earth diaurides intermetallics RAu2 (R=La, Ce, Pr and Eu)

2018 ◽  
Vol 212 ◽  
pp. 44-50 ◽  
Author(s):  
Sardar Ahmad ◽  
Rashid Ahmad ◽  
Saied Jalali-Asadabadi ◽  
Zahid Ali ◽  
Iftikhar Ahmad
Keyword(s):  
Rare Earth ◽  
Elastic Properties ◽  
First Principle

New Quaternary Compounds R3MnAl3Ge2 (R - Rare Earth)

2019 ◽  
Vol 289 ◽  
pp. 21-27
Author(s):  
Natalia Semuso ◽  
Svitlana Pukas ◽  
Yaroslav O. Tokaychuk ◽  
Roman E. Gladyshevskii
Keyword(s):  
Rare Earth ◽  
Earth Metal ◽  
Structure Type ◽  
Hexagonal Structure ◽  
Cell Parameters ◽  
Arc Melting ◽  
Quaternary Compounds ◽  
Pearson Symbol ◽  
The Family ◽  
Trigonal Prismatic Coordination

Nine new quaternaryR3MnAl3Ge2alumogermanides (R= Sm, Gd-Lu) were synthesized by arc melting and their crystal structures were studied by X-ray powder diffraction. All of the compounds crystallize in hexagonal Y3NiAl3Ge2-type structures: Pearson symbolhP9, space groupP-62m. The unit-cell parameters of the isotypic compounds decrease with decreasing radius of the rare-earth metal. The hexagonal structure type Y3NiAl3Ge2(Z= 1) is a quaternary ordering variant of the binary type Fe2P (Z= 3) and the ternary types β1-K2UF6, Lu3CoGa5, Zr3Cu4Si2(Z= 1), ZrNiAl (Z= 3). It belongs to the family of structures with trigonal prismatic coordination of the small atoms.

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