Detection of Individual Vortices in Micron-Size Sr$_{2}$RuO$_{4}$ Rings by Phase-Locked Cantilever
ORAL
Abstract
We describe a feedback-based dynamic cantilever magnetometry technique capable of achieving high magnetic moment sensitivity with low applied fields. Using this technique, we have observed periodic entry of vortices into mesoscopic Sr$_{2}$RuO$_{4}$ rings. The quantized jump in the magnetic moment of the particle produced by individual vortices was measured with a resolution of $7\times 10^{-19}J/T$ at an applied field of 1 G.
*This work was supported by Department of Energy Office of Basic Energy Sciences, grant DEFG02-07ER46453 through the Frederick Seitz Materials Research Laboratory at the University of Illinois at Urbana Champaign.
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