Related Experiment Video
Updated: Nov 17, 2025
07:03
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
9.0K
Magnetoelectric Response of Antiferromagnetic CrI3 Bilayers
Chao Lei1, Bheema L Chittari2, Kentaro Nomura3
1Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States.
Nano Letters
|February 18, 2021
Summary
We predict that van der Waals (vdW) antiferromagnetic bilayers exhibit a strong magnetoelectric response, controllable via electrostatic doping in dual-gated devices. This finding opens new avenues for electrical control of magnetism.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Antiferromagnetic van der Waals (vdW) materials offer unique magnetic properties.
- Understanding the magnetoelectric response in vdW heterostructures is crucial for novel electronic applications.
Purpose of the Study:
- To predict and investigate the magnetoelectric response in vdW antiferromagnetic bilayers.
- To explore electrical control of magnetism through electrostatic doping.
Main Methods:
- Utilized Monte Carlo simulations and mean-field solutions of the anisotropic Heisenberg model.
- Informed model parameters using density functional theory and experimental data.
- Investigated bilayer CrI3 at charge neutrality.
Main Results:
- Predicted a strong, temperature-dependent magnetoelectric response in vdW antiferromagnetic bilayers with weak interlayer coupling.
- Demonstrated independent control of internal displacement fields and carrier densities in dual-gated devices.
- Calculated gate voltage-dependent total magnetization.
Conclusions:
- Layer antiferromagnetic vdW bilayers exhibit significant magnetoelectric effects.
- Electrostatic doping provides a viable method for electrical control of magnetism in these systems.
- Dual-gated devices enable precise tuning of magnetoelectric properties.
Related Concept Videos
01:30Paramagnetism
2.9K
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...
2.9K
01:26Diamagnetism
2.8K
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....
2.8K
01:31Ferromagnetism
2.8K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.8K
01:24Potential Due to a Magnetized Object
650
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
The vector...
650
01:27Magnetic Fields
6.7K
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...
6.7K
01:05Atomic Nuclei: Magnetic Resonance
960
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...
960