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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

3.4K
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...
3.4K
Diamagnetism01:26

Diamagnetism

3.3K
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....
3.3K
Types Of Superconductors01:28

Types Of Superconductors

1.8K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.8K
Paramagnetism01:30

Paramagnetism

3.2K
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...
3.2K
Colors and Magnetism03:02

Colors and Magnetism

14.5K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.5K
Valence Bond Theory02:42

Valence Bond Theory

11.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.5K

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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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High Temperature Ferromagnetism in a GdAg2 Monolayer.

M Ormaza1,2, L Fernández3,4, M Ilyn5

  • 1Universidad del País Vasco , Dpto. Física Aplicada I, E-20018 San Sebastián, Spain.

Nano Letters
|June 2, 2016
PubMed
Summary

We discovered the GdAg2 monolayer alloy, a new material for spintronics. It shows high ferromagnetism with a Curie temperature of 85 K, paving the way for advanced magnetoelectronic devices.

Keywords:
Ferromagnetic monolayerhigh Curie temperaturenanotemplate

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Advanced materials with ferromagnetism, interfacial stability, and tunability are crucial for novel magnetoelectronic phenomena in heterostructures.
  • Rare-earth/noble metal surface alloys offer potential for spintronic applications.

Purpose of the Study:

  • To investigate the ferromagnetic properties of the GdAg2 monolayer alloy.
  • To understand the mechanism behind its high Curie temperature and interfacial properties.

Main Methods:

  • Experimental techniques: X-ray absorption, Kerr effect, angle-resolved photoemission.
  • Theoretical calculations: ab initio methods.
  • Comparative study of GdAg2 and GdAu2 monolayers.

Main Results:

  • GdAg2 monolayer exhibits ferromagnetism with a significantly enhanced Curie temperature (85 K) compared to GdAu2 (19 K).
  • Magnetic coupling is mediated by noble metal-Gd hybrid s,p-d bands, not direct Gd-Gd exchange.
  • Surface confinement and electron occupation of hybrid bands enhance the Curie temperature in GdAg2.
  • GdAg2 demonstrates chemical stability when interfaced with organic semiconductors or magnetic nanodots.

Conclusions:

  • GdAg2 monolayer is a promising material for magnetoelectronics due to its high Curie temperature and stability.
  • The findings highlight the importance of hybrid s,p-d bands in mediating magnetism in rare-earth/noble metal alloys.
  • Encourages further research into rare-earth/noble metal surface alloys for spintronic applications.