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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Engineering magnetic anisotropy and magnetization switching in multilayers by strain.

Kun Tao1, Pengfei Liu2, Qing Guo2

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Strain significantly impacts magnetic properties in metallic multilayers. Applying strain to Ir-Fe and Pt-Fe multilayers allows for tuning magnetic anisotropy energy and magnetization switching.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Materials Science

Background:

  • Metallic multilayers exhibit unique magnetic properties.
  • Magnetic anisotropy energy (MAE) is crucial for magnetic storage applications.
  • Understanding strain effects is key to controlling magnetic behavior.

Purpose of the Study:

  • To investigate the influence of strain on the magnetic properties of metallic multilayers.
  • To explore methods for enhancing and tuning magnetic anisotropy energy (MAE).
  • To examine strain-induced magnetization switching.

Main Methods:

  • Ab initio computational studies were employed.
  • Density Functional Theory (DFT) calculations were performed.
  • Investigated Fe(001) surfaces, Ir-Fe, and Pt-Fe multilayers.

Main Results:

  • Capping Fe(001) surfaces with 5d elements significantly enhances MAE.
  • MAE in Ir-Fe multilayers is tunable over a large range via strain, composition, and structure.
  • Strain can engineer both the amplitude and easy axis of MAE in Pt-Fe multilayers.
  • Magnetization switching by strain was demonstrated.

Conclusions:

  • Strain is a powerful tool for manipulating magnetic properties in metallic multilayers.
  • Ab initio studies provide valuable insights into strain-mediated magnetic phenomena.
  • The findings have implications for designing advanced magnetic materials and devices.