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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Voltage-Controlled Bimeron-Torques Switching of In-Plane Magnetization.

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This study introduces voltage-controlled bimeron-torques to efficiently switch in-plane magnetization, enabling ultralow energy consumption for magnetic random-access memory (MRAM) devices.

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Area of Science:

  • Spintronics
  • Materials Science
  • Nanotechnology

Background:

  • Controlling magnetization in nanodevices is crucial for data storage and logic technologies.
  • In-plane magnetization materials offer accessibility but suffer from lower switching efficiency and stability compared to out-of-plane materials.
  • Existing methods like spin-transfer torques and spin-orbit torques require higher critical currents for in-plane magnetization switching.

Purpose of the Study:

  • To propose and validate a novel mechanism for switching in-plane magnetization using voltage-controlled bimeron-torques.
  • To enable ultralow energy consumption in magnetic random-access memory (MRAM).
  • To overcome limitations associated with perpendicular magnetization and Joule heating in magnetic devices.

Main Methods:

  • Utilizing magnetic bimerons as both spin-angular-momentum carriers and momentum transfer media.
  • Investigating the microscopic origins of the bimeron-torque mechanism.
  • Demonstrating the mechanism's effectiveness in Co(MoTe_{2})_{2} and HgInP_{2}O_{6} monolayers.

Main Results:

  • Magnetic bimerons effectively switch in-plane magnetization.
  • The proposed mechanism achieves ultralow energy consumption for MRAM.
  • The method avoids Joule heating, a common issue in current spintronic devices.
  • Validation through simulations on specific monolayer materials.

Conclusions:

  • Voltage-controlled bimeron-torques offer a viable alternative for switching in-plane magnetization.
  • This mechanism provides a pathway for developing highly efficient and stable MRAM.
  • The approach overcomes key limitations of existing spintronic switching techniques.