Related Experiment Video
Updated: May 1, 2026
09:49
In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
Published on: May 13, 2020
3.2K
Exchange bias effect in nanostructured magnetic oxides.
Journal of Nanoscience and Nanotechnology
|April 23, 2014
Summary
This review explores exchange bias in nanostructured magnetic oxides with diverse magnetic phases. It examines factors influencing this phenomenon and its applications, highlighting unresolved issues in magnetic materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Exchange bias is a critical phenomenon in magnetic heterostructures.
- Nanostructured magnetic oxides exhibit complex magnetic phases, including ferromagnetic, antiferromagnetic, ferrimagnetic, cluster glass, spin glass, and disordered magnetic states.
- Understanding these phases is key to controlling magnetic properties.
Purpose of the Study:
- To review the exchange bias phenomenon in nanostructured magnetic oxides.
- To investigate systems with various coexisting magnetic phases.
- To discuss factors controlling exchange bias and identify unsolved issues.
Main Methods:
- Review of existing literature on exchange bias in magnetic oxides.
- Analysis based on macroscopic experimental techniques.
- Magnetization and magnetoresistance measurements are key tools discussed.
Main Results:
- Exchange bias is observed across a range of magnetic phases in nanostructured oxides.
- Macroscopic measurements provide insights into the underlying mechanisms.
- Potential applications of this phenomenon are identified.
Conclusions:
- Exchange bias in nanostructured magnetic oxides is a complex phenomenon influenced by multiple magnetic phases.
- Further research is needed to address unsolved issues and fully exploit potential applications.
- The review provides a comprehensive overview for researchers in magnetism and materials science.
Related Concept Videos
01:14Diamagnetic Shielding of Nuclei: Local Diamagnetic Current
1.3K
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
1.3K
01:27Biasing of Metal-Semiconductor Junctions
907
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
907
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
01:05Atomic Nuclei: Magnetic Resonance
1.2K
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...
1.2K
01:23Atomic Nuclei: Nuclear Relaxation Processes
1.1K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
1.1K
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