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Colors and Magnetism

Colors and Magnetism

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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...

Diamagnetism

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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.
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Ferromagnetism

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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...

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Related Experiment Video

Updated: Aug 22, 2025

Iron Nanowire Fabrication by Nano-Porous Anodized Aluminum and its Characterization

Iron Nanowire Fabrication by Nano-Porous Anodized Aluminum and its Characterization

Published on: October 6, 2019

Intrinsic Magnetic (EuIn)As Nanowire Shells with a Unique Crystal Structure.

Hadas Shtrikman¹, Man Suk Song¹, Magdalena A Załuska-Kotur²

¹Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel.

|November 7, 2022

Summary

We grew unique (Europium Indium Arsenide)EuInAs shells on Indium Arsenide nanowires, revealing a novel crystal structure. This structure exhibits magnetic properties and potential for advanced electronic applications.

Keywords:

(EuIn)As Eu inversion plane core−shell magnetic mosaic structure nanowires

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Nonstoichiometric magnetic elements in magneto-electronic systems often cause disorder and magnetic scattering.
Developing new materials with controlled magnetic properties is crucial for advanced electronic devices.

Purpose of the Study:

To demonstrate the growth of Europium Indium Arsenide (EuInAs) shells over Indium Arsenide (InAs) and Indium Arsenide Antimonide (InAsSb) core nanowires.
To investigate the crystal structure, magnetic properties, and potential applications of these novel nanostructures.

Main Methods:

Epitaxial growth of (EuIn)As shells on InAs and InAsSb core nanowires.
Atomic and elemental resolution imaging to determine crystal structure.
Molecular dynamics simulations for theoretical support.
Local magnetic and susceptibility mapping to assess magnetic response.

Main Results:

A unique crystal structure of (EuIn)As shells with a dense net of Europium (Eu) inversion planes in a prismatic configuration was achieved.
All investigated nanowires exhibited magnetic response.
A subset of nanowires displayed a DC signal, indicating ferromagnetic order.
The structures show potential for enhanced Zeeman responses, even at zero magnetic field.

Conclusions:

The synthesized (EuIn)As/InAs and (EuIn)As/InAsSb core-shell nanowires possess unique structural and magnetic properties.
These properties offer a promising platform for realizing one-dimensional states with broken time-reversal symmetry, including intrinsic topological superconductivity.
The findings pave the way for novel magneto-electronic devices and quantum applications.