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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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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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Concomitant Light-Reversible Magnetic Response in Multiferroic Oxide Heterostructures for Multiphysics Applications.

Jesús López-Sánchez1, Adolfo Del Campo1, Adrián Quesada1

  • 1Department of Electroceramics, Instituto de Cerámica y Vidrio─Consejo Superior de Investigaciones Científicas (ICV─CSIC), 28049 Madrid, Spain.

ACS Applied Materials & Interfaces
|April 8, 2024
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Summary
This summary is machine-generated.

Researchers demonstrate reversible control of magnetism using visible light in a novel Fe3O4/BaTiO3 heterostructure. This light-matter interaction offers a low-power, wireless method for manipulating magnetic properties in multiferroic devices.

Keywords:
charge distribution modulationepitaxial thin filmsferroelectric domain wall commutationmagneto-structural couplingmultiferroicsphotostrictive materials

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Area of Science:

  • Multiphysics and Nanoscale Science
  • Condensed Matter Physics
  • Materials Science

Background:

  • Multiphysics materials respond to diverse stimuli, crucial for innovative devices.
  • Nanomanufacturing enhances nanoscale synergistic interactions.
  • Light-matter interaction offers low-power, wireless control over magnetism, overcoming limitations of electrical contacts and device heating.

Purpose of the Study:

  • To investigate the reversible modulation of magnetism using visible light in epitaxial Fe3O4/BaTiO3 heterostructures.
  • To explore the underlying mechanisms enabling light-induced magnetic property manipulation.

Main Methods:

  • Fabrication of epitaxial Fe3O4/BaTiO3 heterostructures.
  • Utilized visible light irradiation to probe magnetic property changes.
  • Analyzed magnetoelastic effects and magnetoelectric coupling via ferroelectric domain switching and charged domain walls.

Main Results:

  • Demonstrated remarkable reversible modulation of magnetism using visible light.
  • Identified two key mechanisms: magnetoelastic effect from ferroelectric domain switching and magnetoelectric coupling via charged domain walls.
  • Observed proportional changes in coercivity and remanence upon laser illumination.

Conclusions:

  • Visible light can effectively manipulate magnetic properties in Fe3O4/BaTiO3 heterostructures.
  • The combined magnetoelastic and magnetoelectric effects provide a pathway for low-intensity visible-light control of magnetism.
  • This approach holds promise for developing advanced multiferroic devices with wireless, low-power magnetic control.