Publication

Light controlled and probed ferromagnetism of (Cd,Mn)Te quantum wells

Benoît Marie Joseph Deveaud
2002
Journal Articles

Abstract

Properties of carrier-induced ferromagnetism in modulation-doped quantum wells of p-type (Cd,Mn)Te are assessed by photoluminescence (PL) and PL excitation spectroscopy. Well-chosen illumination makes it possible to deplete the quantum well and thus to control the strength of the ferromagnetic interactions. Spontaneous local magnetization is proportional to the hole concentration p but the Curie temperature T-C varies little over a wide p range, in agreement with the mean-field model for 2D systems. The spatial extension zeta of ferromagnetic correlation is probed by micro- and time-resolved PL and possible mechanisms controlling zeta below T-C are discussed. (C) 2002 Elsevier Science B.V. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/793308b0-4bcc-4e54-80fd-a7cb465a2284

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Benoît Marie Joseph Deveaud
2002
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/793308b0-4bcc-4e54-80fd-a7cb465a2284

About this result

Related concepts (32)

Ferromagnetism

Ferromagnetism is a property of certain materials (such as iron) that results in a significant, observable magnetic permeability, and in many cases, a significant magnetic coercivity, allowing the material to form a permanent magnet. Ferromagnetic materials are familiar metals that are noticeably attracted to a magnet, a consequence of their substantial magnetic permeability. Magnetic permeability describes the induced magnetization of a material due to the presence of an external magnetic field.

Magnetic domain

A magnetic domain is a region within a magnetic material in which the magnetization is in a uniform direction. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction. When cooled below a temperature called the Curie temperature, the magnetization of a piece of ferromagnetic material spontaneously divides into many small regions called magnetic domains. The magnetization within each domain points in a uniform direction, but the magnetization of different domains may point in different directions.

Curie temperature

In physics and materials science, the Curie temperature (TC), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. The Curie temperature is named after Pierre Curie, who showed that magnetism was lost at a critical temperature. The force of magnetism is determined by the magnetic moment, a dipole moment within an atom which originates from the angular momentum and spin of electrons.

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Light controlled and probed ferromagnetism of (Cd,Mn)Te quantum wells

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