Magnetic solids should, under certain circumstances, show macroscopic quantum behavior,
in which coherence exists between completely distinct magnetization states, each involving …

Recently developed methods to investigate quantum spin systems are reviewed. These
methods are based on somewhat unconventional applications of the spin coherent state …

The influence of particle interactions on the superparamagnetic relaxation time has been
studied by Mössbauer spectroscopy in samples of maghemite (y-Fe 2 O 3) with different …

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Quantum tunneling, the passage of a microscopic system from one state to another by way
of a classically forbidden path, is theoretically possible in the macroscopic world. One can …

γ‐Fe2O3 nanocrystals have been synthesized in a polymer matrix by an ion exchange and
precipitation reaction. The particles are crystalline with a mean diameter of 85 Å. The unit …

Reviewing macroscopic quantum phenomena and quantum dissipation, from the
phenomenology of magnetism and superconductivity to the presentation of alternative …

The magnetic properties of γ‐Fe2O3 nanoparticles synthesized by vaporization
condensation in a solar image furnace have been studied using both magnetic …

Starting from the Néel state of a uniaxial antiferromagnetic particle, we show that, due to the
tunneling of the Néel vector between easy directions, the ground state of a sufficiently small …

We have measured the dc magnetization at low temperatures of tetragonal crystals of Mn 12
acetate complex [Mn 12 O 12 (CH 3 COO) 16 (H 2 O) 4], a material composed of a large …