scholarly journals Large linear non-saturating magnetoresistance and high mobility in ferromagnetic MnBi

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yangkun He ◽  
Jacob Gayles ◽  
Mengyu Yao ◽  
Toni Helm ◽  
Tommy Reimann ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Effective Mass ◽  
Fermi Energy ◽  
High Mobility ◽  
Ferromagnetic Materials ◽  
Charge Carriers ◽  
Fermi Velocity ◽  
High Curie Temperature ◽  
Pulsed Field ◽  
Mobility Of Charge Carriers

AbstractA large non-saturating magnetoresistance has been observed in several nonmagnetic topological Weyl semi-metals with high mobility of charge carriers at the Fermi energy. However, ferromagnetic systems rarely display a large magnetoresistance because of localized electrons in heavy d bands with a low Fermi velocity. Here, we report a large linear non-saturating magnetoresistance and high mobility in ferromagnetic MnBi. MnBi, unlike conventional ferromagnets, exhibits a large linear non-saturating magnetoresistance of 5000% under a pulsed field of 70 T. The electrons and holes’ mobilities are both 5000 cm2V−1s−1 at 2 K, which are one of the highest for ferromagnetic materials. These phenomena are due to the spin-polarised Bi 6p band’s sharp dispersion with a small effective mass. Our study provides an approach to achieve high mobility in ferromagnetic systems with a high Curie temperature, which is advantageous for topological spintronics.

Screening and Design of Novel 2D Ferromagnetic Materials with High Curie Temperature above Room Temperature

2018 ◽  
Vol 10 (45) ◽  
pp. 39032-39039 ◽  
Author(s):  
Zhou Jiang ◽  
Peng Wang ◽  
Jianpei Xing ◽  
Xue Jiang ◽  
Jijun Zhao
Keyword(s):  
Curie Temperature ◽  
Room Temperature ◽  
Ferromagnetic Materials ◽  
High Curie Temperature

Strain-engineering the in-plane electrical anisotropy of GeSe monolayers

2020 ◽  
Vol 22 (2) ◽  
pp. 914-918 ◽  
Author(s):  
Zongbao Li ◽  
Xinsheng Liu ◽  
Xia Wang ◽  
Yusi Yang ◽  
Shun-Chang Liu ◽  
...  
Keyword(s):  
Effective Mass ◽  
Strain Engineering ◽  
Charge Carriers ◽  
Electrical Anisotropy ◽  
Mobility Of Charge Carriers

The anisotropic ratio of the effective mass and mobility of charge carriers of GeSe monolayer along two principle axes can be controlled by using simple strain conditions.

Molecular Dynamics of Linear and Crosslinked Polyester Urethanes Studied by Dielectric Spectroscopy

2011 ◽  
Vol 43 (6) ◽  
pp. 559-576 ◽  
Author(s):  
S. Oprea ◽  
V.-E. Musteata ◽  
V. O. Potolinca
Keyword(s):  
Molecular Dynamics ◽  
Dielectric Spectroscopy ◽  
Charged Particles ◽  
High Mobility ◽  
Charge Carriers ◽  
Chemical Crosslinking ◽  
Elastic State ◽  
Segmental Mobility ◽  
Relaxation Temperature ◽  
Mobility Of Charge Carriers

The molecular dynamics of crosslinked polyurethanes have been studied by dielectric spectroscopy and compared with the dynamics of linear polyurethanes. Two local relaxations, γ and β, and a primary relaxation, α, were observed for all the samples, appearing in relation with the increase in temperature. The conductivity was studied at temperatures higher than the glass transition temperature and it was found to decrease with the increasing content of crosslinker. The presence of crosslinks strongly influences their dielectric properties, especially in the elastic state. The linear polyurethane exhibits the lowest α-relaxation temperature. For the crosslinked samples, α-relaxation temperature increases with increase in the amount of crosslinkers; β- and γ-relaxations are less affected by chemical crosslinking and their activation energies are in the ranges 40–55 and 34–37 kJ/mol, respectively. For the linear polyurethane, there is an exception in the case of the γ-relaxation, which has a higher activation energy determined by its physical crosslinks. Conductivity analysis reveals a high mobility of charge carriers and low barriers for the transport of the charged particles. Also, the conductivity process is dependent on the segmental mobility of polymers.

Nonstoichiometric Defects in Semiconductor SnTe Thin Films

1995 ◽  
Vol 378 ◽  
Author(s):  
O. N. Nashchekina ◽  
E. I. Rogacheva ◽  
L. P. Shpakovskaya ◽  
V. I. Pinegin ◽  
A. I. Fedorenko
Keyword(s):  
Carrier Density ◽  
Thermal Evaporation ◽  
High Mobility ◽  
Diffraction Method ◽  
Charge Carriers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mobility Of Charge Carriers ◽  
Temperature Dependences ◽  
Hot Wall Epitaxy

AbstractThe mono- and polycrystalline films of the SnTe1+x semiconducting phase with controlled content of nonstoichiometric defects (NSD) were grown by thermal evaporation and hot wall epitaxy methods from the charges of different composition. The concentration of NSD was determined using X-Ray diffraction method and the measurements of carrier density. The temperature dependences of electrical conductivity and Hall coefficient were obtained in the temperature range of 77 - 300 K. The best results were obtained for hot wall epitaxy method: the perfect monocrystalline films with NSD content corresponding to x =0-0,025 and high mobility of charge carriers were grown.

Time-reversal-breaking Weyl nodal lines in two-dimensional A3C2 (A = Ti, Zr, Hf) intrinsically ferromagnetic materials with high Curie temperature

Nanoscale ◽  
2021 ◽  
Author(s):  
Feng Zhou ◽  
Ying Liu ◽  
Minquan KUANG ◽  
Peng Wang ◽  
Jianhua WANG ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Time Reversal ◽  
Three Dimensional ◽  
Ferromagnetic Materials ◽  
High Curie Temperature ◽  
Two Dimensional ◽  
Nodal Lines ◽  
Spin Polarized

Most materials that feature nontrivial topological band topology are spin-degenerate and three dimensional, strongly restricting them from application in spintronic nanodevices. Hence, two-dimensional (2D) intrinsically spin-polarized systems with rich topological...

Efficient FAPbI3-PbS quantum dot graphene-based phototransistors

2021 ◽  
Author(s):  
Samaneh Aynehband ◽  
Maryam Mohammadi ◽  
Rana Poushimin ◽  
Jean-Michel Nunzi ◽  
A. Simchi
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Quantum Dot ◽  
High Performance ◽  
High Mobility ◽  
Charge Carriers ◽  
Colloidal Quantum Dots ◽  
Mobility Of Charge Carriers ◽  
Tunable Optical Properties ◽  
Pbs Quantum Dot

The high mobility of charge carriers in graphene (G) combined with the ease of processing and tunable optical properties of colloidal quantum dots (CQD) have provided high-performance hybrids for the...

AlxGa1−xAs/GaAs heterostructures with abnormally high mobility of charge carriers

2015 ◽  
Vol 38 ◽  
pp. 107-112 ◽  
Author(s):  
P.V. Seredin ◽  
A.S. Lenshin ◽  
I.N. Arsentiev ◽  
I.S. Tarasov
Keyword(s):  
High Mobility ◽  
Charge Carriers ◽  
Mobility Of Charge Carriers

Charge-transport in Organic Semiconductors: Probing High Mobility with Light

2013 ◽  
Vol 1568 ◽  
Author(s):  
Demetrio A da Silva Filho ◽  
Pedro Henrique de Oliveira Neto ◽  
M. Carmen Ruiz Delgado ◽  
Juan T. Lopez Navarrete ◽  
Juan Casado
Keyword(s):  
Charge Transport ◽  
Organic Semiconductors ◽  
High Mobility ◽  
Charge Carriers ◽  
Experimental Result ◽  
Mobility Of Charge Carriers ◽  
Vis Spectroscopy ◽  
Efficient Charge ◽  
Processing Techniques ◽  
Improve Device

ABSTRACTEfficient charge transport is key to the operation of the various devices based on organic semiconductors, such as OLEDs, OPVs and OFETs. Both academia and industry are investing heavily in the development of new organic materials and processing techniques to improve device performance. An important parameter to tweak is the mobility of charge carriers. Triggered by an experimental result, here we investigate whether this parameter can be probed indirectly using UV-VIS spectroscopy. This would simplify the process of characterization and optimization of the mobility in amorphous molecular films, for example.

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