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Zap with Microwaves to Reverse Spin

• Physics 16, s118

Irradiating a uniaxial magnetic system with a selected sequence of microwave pulses can induce within the system quantum oscillations that trigger the fabric’s spins to flip backwards and forwards.

S. Miyashita/College of Tokyo and B. Barbara/CNRS Grenoble

To make higher-density magnetic information methods, researchers need to crystalline supplies which have switchable magnetic orientations. However for a few of these supplies, switching the magnetization path—for instance from spin-up to spin-down—requires overcoming a big power barrier. Now Seiji Miyashita on the College of Tokyo and Bernard Barbara of the Institut Néel, CNRS Grenoble, France, predict that experimentalists may reverse a fabric’s magnetization by making use of to it a selected sequence of microwave or optical-frequency pulses [1]. The strategy may discover purposes in quantum data storage.

To reverse the spin of a magnetic materials, researchers can apply excessive temperatures or excessive magnetic fields to push the system over the potential power barrier that separates its spin states. Another choice is to induce resonant quantum tunneling to maneuver electrons by means of the barrier. Miyashita and Barbara suggest an extra technique that bypasses the constraints related to the applying of intense magnetic fields in these earlier strategies.

Miyashita and Barbara think about a magnetic crystalline system wherein the pointing instructions of the spins are uniaxially aligned. They then calculate what occurs in the event that they hit the system with a collection of electromagnetic pulses. They present that such pulses can induce oscillations within the orientations of the spins the place the amplitude of the oscillations prolong above the potential power barrier. For a fastidiously designed pulse sequence, the duo predicts that the oscillations could be quick sufficient—have a excessive sufficient power—that with every backwards and forwards they totally flip the spins’ instructions.

The researchers assume that their strategy might be used to control a number of qubits product of single-molecule magnets or rare-earth-element-based crystals. In addition they assume that the strategy may present an alternate technique for integrating quantum magnetic methods into computing architectures.

–Rachel Berkowitz

Rachel Berkowitz is a Corresponding Editor for Physics Journal based mostly in Vancouver, Canada.


  1. S. Miyashita and B. Barbara, “ cross an power barrier at zero kelvin with out tunneling impact,” Phys. Rev. Lett. 131, 066701 (2023).

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