Real-Time Measurements of Magnetic Dynamics in Single Ni Nanoparticles
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We measure magnetic motion in single nanometer scale Ni particles in real time, using a technique of spin-to-charge conversion in quantum dots. Extraordinary long spin relaxation time is confirmed (~10 msec), similar to spins in nonmagnetic quantum dots. Highly sensitive yet simple technique to study magnetic properties developed, as an alternative to SQUIDs (superconducting quantum interference technique). Confirming strongly underdamped magnetic dynamics opens a different path to study macroscopic quantum effects in magnetization and spin transfer. Ni nanoparticle is an island in a single electron transistor. Magnetic motion at millikelvin temperatures creates an internal charge displacement, which can be detected electrometrically as a shift in background charge.
- Nano@Tech Lecture Series