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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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Heat-Assisted Multiferroic Solid-State Memory.

Serban Lepadatu1, Melvin M Vopson2

  • 1Jeremiah Horrocks Institute for Mathematics, Physics and Astronomy, University of Central Lancashire, Preston PR1 2HE, UK. SLepadatu@uclan.ac.uk.

Materials (Basel, Switzerland)
|August 26, 2017
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Summary

This study proposes a novel heat-assisted multiferroic memory. It uses voltage-induced stress to switch magnetic data, enabling contactless data writing for solid-state memory applications.

Keywords:
antiferroelectricmagnetic memorymicromagneticsmultiferroic

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Nanotechnology

Background:

  • Multiferroic materials offer potential for advanced memory devices.
  • Controlling magnetic properties via electric fields is key for energy-efficient data storage.

Purpose of the Study:

  • To propose and analyze a heat-assisted multiferroic solid-state memory design.
  • To investigate contactless bit writing using strain-mediated magnetoelectric coupling.

Main Methods:

  • Utilized a PbNbZrSnTiO₃ antiferroelectric layer and a NiFe magnetic free layer.
  • Employed a 3D, temperature-dependent magnetization dynamics model.
  • Simultaneously solved Landau-Lifshitz-Bloch and heat flow equations.

Main Results:

  • Identified an operating region for reliable magnetization switching (80-180 MPa stress).
  • Determined optimal temperature ranges (0.65-0.99 of Curie temperature).
  • Demonstrated contactless, thermally activated magnetization switching.

Conclusions:

  • The proposed design enables efficient, contactless data writing in multiferroic memory.
  • Strain-mediated magnetoelectric coupling is a viable mechanism for solid-state memory operation.
  • This approach paves the way for next-generation high-density data storage.