Related Experiment Video
Updated: Apr 17, 2026
11:24
Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
Published on: July 11, 2025
17.5K
Spin magnetic proximity effect in graphene superlattices
Yijie Lin1, Daniel Burrow2, Jesus C Toscano-Figueroa2
1Department of Materials Science and Engineering, National University of Singapore, Singapore, Singapore.
Nature Communications
|April 15, 2026
Summary
Magnetic proximity effects in graphene, using cobalt contacts, enable gate-tunable spin control. This research demonstrates significant spin polarization for low-power spintronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- The magnetic proximity effect is crucial for controlling spin-resolved band structures in materials like graphene.
- Low carrier densities, particularly near the charge neutrality point, enhance spin-dependent transport signatures.
Purpose of the Study:
- To investigate the influence of magnetic proximity on graphene's spin-resolved band structure using pure spin currents.
- To explore gate-tunable spin polarization and its potential for spintronic applications.
Main Methods:
- Utilizing cobalt contacts to induce magnetic proximity in graphene.
- Probing spin-resolved bands with pure spin currents and nonlocal measurements.
- Employing graphene-boron nitride aligned superlattices and bilayer graphene devices.
Main Results:
- Observed a gate-tunable inversion of the nonlocal spin signal near the charge neutrality point.
- Demonstrated that proximity-induced spin splitting governs spin transport across primary and reconstructed bands.
- Achieved spin polarizations approaching 50% and nonlocal spin resistances exceeding 300 Ω in bilayer graphene superlattices.
Conclusions:
- Electrically controlled spin polarization via proximity interactions at low carrier densities is feasible.
- This approach offers significant opportunities for developing low-power spintronic devices.
Related Concept Videos
01:26Diamagnetism
3.5K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
3.5K
01:27Magnetic Fields
8.0K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
A magnetic field is defined by the force that a charged particle experiences...
8.0K
01:30Paramagnetism
3.3K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
3.3K
01:23Magnetic Field due to Moving Charges
12.6K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
12.6K
01:03Atomic Nuclei: Nuclear Spin State Overview
2.3K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
2.3K
01:05Atomic Nuclei: Magnetic Resonance
1.4K
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
1.4K