Related Experiment Video
Updated: Jun 4, 2025
11:54
Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
Published on: February 8, 2018
10.2K
Magnetic-proximity-induced anomalous Hall effect at the EuO/Sb2Te3interface
Indraneel Sinha1, Shreyashi Sinha1, Subham Naskar1
1Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 31, 2024
Summary
Researchers developed a stable thin film approach for the quantum anomalous Hall effect (QAHE) using EuO on Sb2Te3. This breakthrough offers a scalable and chemically stable method for next-generation electronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- The quantum anomalous Hall effect (QAHE) is crucial for dissipation-free electronics.
- Existing QAHE materials like doped Bi2Te3 and twisted graphene are unstable.
- Integrating magnetic oxides with topological insulators (TIs) is challenging due to material compatibility.
Purpose of the Study:
- To develop a stable and scalable thin-film material for QAHE.
- To overcome challenges in epitaxially growing oxides on chalcogenide TIs.
- To demonstrate a novel material system for robust QAHE devices.
Main Methods:
- Pulsed laser deposition (PLD) for growing EuO on Sb2Te3.
- Utilizing vacuum-cleaved and annealed Sb2Te3(0001) surfaces.
- Characterization via X-ray reflectivity (XRR) and scanning tunneling microscopy (STM).
Main Results:
- Achieved pristine EuO/Sb2Te3 interface and surface under optimized PLD conditions.
- Observed a strong anomalous Hall effect (AHE) in devices, a precursor to QAHE.
- Demonstrated successful epitaxy of EuO on Sb2Te3.
Conclusions:
- The EuO/Sb2Te3 heterostructure offers a promising, stable platform for QAHE.
- This thin-film approach is scalable and improves chemical stability over existing methods.
- Paves the way for practical applications in dissipation-free electronics and spintronics.
Keywords:
anomalous hall effectferromagnetic insulatormagnetic proximity effectmagnetic topological insulatorspulse laser depositionMore Related Videos
10:36Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
10.5K
06:49Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
Published on: April 12, 2019
7.6K
Related Concept Videos
01:30The Hall Effect
2.2K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
2.2K
01:27π Electron Effects on Chemical Shift: Overview
1.0K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.0K
01:24Metal-Semiconductor Junctions
291
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
291
01:26Diamagnetism
2.4K
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....
2.4K
01:28Magnetostatic Boundary Conditions
865
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
865
01:31Ferromagnetism
2.4K
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...
2.4K