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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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...
Paramagnetism01:30

Paramagnetism

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...
Diamagnetism01:26

Diamagnetism

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.
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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Atomic Nuclei: Magnetic Resonance01:05

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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...

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Raman scattering studies on multiferroic YMnO(3).

H Fukumura1, S Matsui, H Harima

  • 1Department of Electronics and Information Science, Kyoto Institute of Technology, Kyoto 606-8585, Japan.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 23, 2011
PubMed
Summary
This summary is machine-generated.

Yttrium manganese oxide (YMnO3) exhibits multiferroic properties. Raman scattering reveals spin-phonon coupling below the Néel temperature and a structural phase change above the Curie temperature.

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Last Updated: May 31, 2026

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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7&#8722;&#948;/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
06:49

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

Published on: April 12, 2019

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • Yttrium manganese oxide (YMnO3) is a multiferroic material.
  • Coexistence of ferroelectric and antiferromagnetic ordering in YMnO3.

Purpose of the Study:

  • Investigate the multiferroic properties of YMnO3.
  • Study the temperature-dependent behavior of YMnO3 using Raman scattering.
  • Explore the coupling between spin and phonon systems.

Main Methods:

  • Raman scattering spectroscopy.
  • Temperature-dependent measurements from 15 K to 1200 K.
  • Comparison with theoretical predictions for Raman-active phonon modes.

Main Results:

  • Observed anomalous phonon spectra variation at the Néel temperature (T(N) ~ 80 K) in the ferroelectric phase.
  • Identified a coupling between spin and phonon systems below T(N).
  • Reported a sudden spectral change at the Curie temperature (T(C) > 900 K) in the paraelectric phase, indicating an abrupt structural phase transition.

Conclusions:

  • YMnO3 exhibits significant spin-phonon coupling in its ferroelectric phase.
  • A distinct structural phase transition occurs from ferroelectric to paraelectric state above T(C).
  • Raman scattering is a valuable tool for probing multiferroic behavior and phase transitions in YMnO3.