Ferromagnetic semiconductors offer an efficient way to achieve high spin polarization via spin filtering effect. Large tunneling magnetoresistance (TMR) can then be realized when multiple spin filters are put in series, as recently demonstrated in van der Waals 2D A-type antiferromagnets such as CrI_{3} and CrSBr. However, the interlayer antiferromagnetic ground state of these magnets inherently results in a high resistance state at zero field, and this volatile behavior limits potential applications. Here we fabricate hybrid spin filters using 2D ferromagnetic metal Fe_{3}GeTe_{2} and semiconductor CrBr_{3}, which are nonvolatile as two magnets are magnetically decoupled. We achieve large TMR of around 100%, with its temperature dependence well fitted by the extended Jullière model. Additionally, the devices allow spin injection tuned through bias voltage, and TMR polarity reversals are observed. Our work opens a new route to develop 2D magnetic semiconductor based spintronics.
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http://dx.doi.org/10.1103/PhysRevLett.134.077001 | DOI Listing |
ACS Omega
March 2025
Department of Biochemical Engineering, University College London, Gower Street, London WC1E 6BT, U.K.
Traditional poly(ether sulfone) (PES) filters, widely used for sterile, viral, and ultrafiltration, often exhibit restrictions in their selectivity-permeability profile due to their heterogeneous pore size distribution. This limitation has sparked interest in developing novel isoporous membrane materials and fabrication techniques. Among promising candidates, block copolymer (BCP) membranes produced via self-assembly and nonsolvent-induced phase separation (SNIPS) offer significant advantages, including tunable pore size, narrow pore size distribution, high porosity, and enhanced mechanical flexibility.
View Article and Find Full Text PDFPhys Chem Chem Phys
March 2025
School of Energy and Mechanical Engineering, Energy Materials Computing Center, Jiangxi University of Science and Technology, Nanchang 330013, China.
Modulating the interface between the molecule and electrode is an effective way to enhance the spin-polarized transport properties of molecular junctions. In this study, using first-principles calculations combined with the nonequilibrium Green's function method, we demonstrate that the spin-transport properties of Cr(pyz) (pyz = pyrazine)-based van der Waals junctions can be significantly regulated by the tunneling barrier and dipole between the molecule-electrode interface. Specifically, we find that the charge transfer and redistribution process within Cr(pyz) can give rise to a transition from a semiconductor to a half-metal in the tunneling junction, leading to a notable enhancement of the spin filtering efficiency (SFE).
View Article and Find Full Text PDFPhys Rev Lett
February 2025
Xi'an Jiaotong University, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Shaanxi Province Key Laboratory of Advanced Materials and Mesoscopic Physics, School of Physics, Xi'an 710049, China.
Ferromagnetic semiconductors offer an efficient way to achieve high spin polarization via spin filtering effect. Large tunneling magnetoresistance (TMR) can then be realized when multiple spin filters are put in series, as recently demonstrated in van der Waals 2D A-type antiferromagnets such as CrI_{3} and CrSBr. However, the interlayer antiferromagnetic ground state of these magnets inherently results in a high resistance state at zero field, and this volatile behavior limits potential applications.
View Article and Find Full Text PDFACS Nano
March 2025
Institute of Quantum Materials and Devices, School of Materials Science and Engineering, State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China.
In spintronics, there has been increasing interest in two-dimensional (2D) magnetic materials. The well-defined layered crystalline structure, interface conditions, and van der Waals stacking of these materials offer advantages for the development of high-performance spintronic devices. Spin-orbit torque (SOT) devices and the tunneling magnetoresistance (TMR) effect based on these materials have emerged as prominent research areas.
View Article and Find Full Text PDFAnnu Int Conf IEEE Eng Med Biol Soc
July 2024
Arterial spin labeling (ASL) magnetic resonance imaging (MRI) is the only non-invasive technique for measuring regional cerebral blood flow (CBF) and related neurovascular properties. ASL data can be acquired at multiple echo times (TE) to estimate transit time from blood to tissue or blood to CSF. However, this introduces a significant challenge in ASL data processing due to the increased signal decay during long TEs, further exacerbating the low signal-to-noise ratio (SNR) of ASL signal.
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