R.M. Shelby, R.M. MacFarlane, et al.
Physical Review B
Magnetic resonance force microscopy was used to study the behavior of small ensembles of unpaired electron spins in silica near a micrometer-size ferromagnetic tip. Using a cantilever-driven spin manipulation protocol and a magnetic field gradient greater than 105T/m, signals from as few as 100 net spins within a 20 nm thick resonant slice could be studied. A sixfold increase in the spin-lattice relaxation rate was found within 800 nm of the ferromagnet, while no effect due to silica surface proximity was detected. The results are interpreted in terms of Larmor-frequency magnetic field fluctuations emanating from the ferromagnet. © 2001 The American Physical Society.
R.M. Shelby, R.M. MacFarlane, et al.
Physical Review B
H.J. Mamin, T.H. Oosterkamp, et al.
Nano Letters
D. Rugar, R. Budakian, et al.
Nature
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Physical Review Letters