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The first NATO Advanced Workshop on Quantum Tunneling of Magnetization (QTM) was organized and co-directed by Bernard Barbara, Leon Gunther, Nicolas Garcia, and Anthony Leggett and was held from June, 27 through July 1, 1994 in Grenoble and Chichilianne, France. These Proceedings include twenty-nine articles that represent the contributions of the participants in the Workshop. Quantum Tunneling of Magnetization is not only interesting for purely academic reasons. It was pointed out in the review article by L. Gunther in the December, 1990 issue of Physics World, that QTM may be destined to play a significant role within the next two decades in limiting the density of information storage in magnetic systems. Recent advances have indicated that this limitation may well be reached even earlier than first predicted. Furthermore, the number of people who have entered the field of study of QTM during these past few years has increased many fi)ld. The time was therefore opportune to hold a Workshop to bring together for the first time the leading researchers of QTM, both theoretical and experimental, so as to discuss the current status of the field. The most controversial issue at the time of the Workshop was how to establish r.eliable criteria for determining whether experimental results do indeed reveal manifestations of QTM. We believe that much progress was made at the Workshop on this issue.








Content:
Front Matter....Pages i-xiii
Macroscopic Quantum Effects in Magnetic Systems: An Overview....Pages 1-18
Theory of Mesoscopic Quantum Tunneling in Magnetism: A WKB Approach....Pages 19-57
Quantum Spin-Tunneling:A Path Integral Approach....Pages 59-76
Quantum Tunneling in Small Particles....Pages 77-89
Macroscopic Quantum Tunneling in Ferromagnets and Antiferromagnets....Pages 91-105
Monte Carlo Simulations on Reversal Magnetization of Small Clusters....Pages 107-120
Quantum Tunneling of Magnetization....Pages 121-136
Relaxation and Mesoscopic Quantum Tunneling of Magnetization in Amorphous Rare-Earth Alloys....Pages 137-156
Linear Response and Thermal Equilibrium Noise of Magnetic Materials at Low Temperature: Logarithmic Relaxation, 1/F Noise, Activation and Tunnelling....Pages 157-169
AC Susceptibility Relaxation Studies on a Manganese Organic Cluster Compound: Mn12Ac....Pages 171-188
Evidence for Quantum Tunneling of the Magnetization in Mn12A C....Pages 189-207
Acoustic and Magnetic Properties of Rare-Earth-Ion-Doped Glasses: Elastic and Magnetic Tunneling States....Pages 209-226
DC-SQUID Magnetization Measurements of Single Magnetic Particles....Pages 227-241
Macroscopic Quantum Tunneling of Magnetization in Natural and Artificially Engineered Ferritin....Pages 243-255
Domain Wall Tunneling in a One Dimensional Ferromagnet....Pages 257-272
Nuclear Spin Dissipation in Magnetic Macroscopic Quantum Phenomena....Pages 273-287
Macroscopic Quantum Tunneling and Dissipation of Domain Walls in Ferromagnetic Metals....Pages 289-309
The Collective Coordinate Method and Bloch Wall Motion....Pages 311-317
Spin Parity Effects and Macroscopic Quantum Coherence of Bloch Walls....Pages 319-345
Spin Environments & the Suppression of Quantum Coherence....Pages 347-371
Unconventional Environments....Pages 373-398
Particle Tunneling and “Magnetization Tunneling” in the Presence of Electron-Electron Interaction....Pages 399-412
On the Search for Quantum Tunneling of Magnetization....Pages 413-434
Crossover from Thermal to Quantum Regime in Vortex Motion in Conventional Type II Superconductors....Pages 435-453
Flux Motion by Quantum Tunneling....Pages 455-469
Macroscopic Quantum Tunneling in Long Josephson Junctions....Pages 471-479
Quantum Computing and Spin Physics....Pages 481-493
Scientific Summary of the Meeting....Pages 495-496
Back Matter....Pages 497-500
....Pages 501-507
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