Emerging memories

How is information written in STT-MRAM?

  1. AOnly with a magnetic field generated by an external coil
  2. BBy irradiating it with ultraviolet light
  3. CBy reversing the magnetization with spin-transfer torque from a spin-polarized current
Show answer and explanation

Answer: C. By reversing the magnetization with spin-transfer torque from a spin-polarized current

In STT-MRAM, current is passed through the MTJ, and the angular momentum of the electrons' spins is transferred to the magnetic layer (spin-transfer torque), reversing its magnetization. This requires less write current than field-based writing and suits scaling.

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