Matthew P. A. Fisher, Peter B. Weichman, et al.
Physical Review B
We report low-temperature measurements of the frequency-dependent magnetic noise and magnetic susceptibility of nanometer-scale antiferromagnetic horse-spleen ferritin particles, using an integrated dc SQUID microsusceptometer. A sharply defined resonance near 1 MHz develops below T0.2 K. The behavior of this resonance as a function of temperature, applied magnetic field, and particle concentration indicates that it results from macroscopic quantum tunneling of the Néel vector of the antiferromagnets. © 1992 The American Physical Society.
Matthew P. A. Fisher, Peter B. Weichman, et al.
Physical Review B
G. Grinstein, David Mukamel, et al.
Physical Review Letters
J.E.S. Socolar, G. Grinstein, et al.
Physical Review E
G. Grinstein, R.H. Koch
Physical Review Letters