J.C. DeLuca, R.J. Gambino, et al.
Journal of Applied Physics
We analyze in detail a novel integrated SQUID technique for studying magnetic noise and susceptibility. In particular, we show how the susceptibility, π/2 rule and the fluctuation-dissipation theorem (FDT) are affected by large demagnetizing factors and by the geometry of our pickup and field coils. We present data on the spin glass Eu0.4Sr0.6S as a function of temperature. We confirm the FDT and show evidence against the conventional power-law dynamics in the spin-glass phase.
J.C. DeLuca, R.J. Gambino, et al.
Journal of Applied Physics
A.P. Malozemoff, L. Krusin-Elbaum, et al.
Physical Review B
R.J. Gambino, T.R. McGuire, et al.
IEEE Transactions on Magnetics
Y. Yeshurun, A.P. Malozemoff
Physical Review Letters