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Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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Switching a Perpendicular Ferromagnetic Layer by Competing Spin Currents.

Qinli Ma1, Yufan Li1, D B Gopman2

  • 1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.

Physical Review Letters
|March 31, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel spintronic device using two heavy metals to switch magnetization with current alone. This breakthrough eliminates the need for external magnetic fields in spin-orbit torque switching, advancing nonvolatile memory technologies.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Controlling magnetism electrically is a key goal in spintronics.
  • Current-induced spin-orbit torque (SOT) offers a promising route but typically requires magnetic fields.
  • Existing SOT switching methods are limited by the need for external fields or complex setups.

Purpose of the Study:

  • To demonstrate magnetic switching using only an in-plane current.
  • To overcome limitations of current SOT switching techniques.
  • To investigate a novel spintronic device structure for efficient magnetization control.

Main Methods:

  • Fabrication of a novel spintronic device structure with two heavy metals.
  • Electrical current application to induce spin currents.
  • Magnetic domain imaging to observe magnetization switching.
  • Analysis of domain wall motion under current stimulus.

Main Results:

  • The novel device structure successfully switched perpendicular CoFeB magnetization using only an in-plane current.
  • Competing spin currents from the two heavy metals enabled field-free switching.
  • Asymmetrical domain wall motion was observed under current, indicating selective switching.

Conclusions:

  • The developed structure enables efficient, field-free SOT switching.
  • This work challenges conventional understanding of SOT mechanisms.
  • The findings pave the way for practical spintronic nonvolatile memory applications.