Quantum Tunneling of Magnetization — QTM ’94

1. Front Matter

   Pages i-xiii

   PDF

2. General Introduction

   1. Macroscopic Quantum Effects in Magnetic Systems: An Overview

      • A. J. Leggett

      Pages 1-18

3. Particles (Theory)

   1. Theory of Mesoscopic Quantum Tunneling in Magnetism: A WKB Approach

      • J. L. Van Hemmen, A. Sütö

      Pages 19-57

   2. Quantum Spin-Tunneling:A Path Integral Approach

      • R. Schilling

      Pages 59-76

   3. Quantum Tunneling in Small Particles

      • Eugene M. Chudnovsky

      Pages 77-89

   4. Macroscopic Quantum Tunneling in Ferromagnets and Antiferromagnets

      • Herbert Simanjuntak

      Pages 91-105

   5. Monte Carlo Simulations on Reversal Magnetization of Small Clusters

      • P. A. Serena, N. Garcia

      Pages 107-120

4. QTM in Magnetic Relaxation (Experiment)

   1. Quantum Tunneling of Magnetization

      • Javier Tejada, Xixiang Zhang

      Pages 121-136

   2. Relaxation and Mesoscopic Quantum Tunneling of Magnetization in Amorphous Rare-Earth Alloys

      • J. I. Arnaudas, A. Del Moral, C. De La Fuente

      Pages 137-156

   3. Linear Response and Thermal Equilibrium Noise of Magnetic Materials at Low Temperature: Logarithmic Relaxation, 1/F Noise, Activation and Tunnelling

      • S. Vitale, M. Cerdonio, G. A. Prodi, A. Cavalleri, P. Falferi, A. Maraner

      Pages 157-169

   4. AC Susceptibility Relaxation Studies on a Manganese Organic Cluster Compound: Mn12Ac

      • Miguel A. Novak, Roberta Sessoli

      Pages 171-188

   5. Evidence for Quantum Tunneling of the Magnetization in Mn12A C

      • C. Paulsen, J.-G. Park

      Pages 189-207

   6. Acoustic and Magnetic Properties of Rare-Earth-Ion-Doped Glasses: Elastic and Magnetic Tunneling States

      • G. Bellessa, N. Vernier, F. Lerbet

      Pages 209-226

   7. DC-SQUID Magnetization Measurements of Single Magnetic Particles

      • W. Wernsdorfer, K. Hasselbach, D. Mailly, B. Barbara, A. Benoit, L. Thomas et al.

      Pages 227-241

5. Macroscopic Coherence of Magnetization (Experiment)

   1. Macroscopic Quantum Tunneling of Magnetization in Natural and Artificially Engineered Ferritin

      • S. Gider, D. D. Awschalom

      Pages 243-255

6. Quantum Tunneling of Domain Walls (Experiment)

   1. Domain Wall Tunneling in a One Dimensional Ferromagnet

      • Kimin Hong, N. Giordano

      Pages 257-272

7. Dissipation in QTM (Theory)

   1. Nuclear Spin Dissipation in Magnetic Macroscopic Quantum Phenomena

      • Anupam Garg

      Pages 273-287

   2. Macroscopic Quantum Tunneling and Dissipation of Domain Walls in Ferromagnetic Metals

      • Gen Tatara, Hidetoshi Fukuyama

      Pages 289-309

   3. The Collective Coordinate Method and Bloch Wall Motion

      • A. O. Caldeira

      Pages 311-317

8. Spin Parity Effects in QTM (Theory)

   1. Spin Parity Effects and Macroscopic Quantum Coherence of Bloch Walls

      • Hans-Benjamin Braun, Daniel Loss

      Pages 319-345

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.

• Experiment
• Quantum tunnelling
• Rover
• magnetism
• measurement
• simulation
• temperature

• Department of Physics and Astronomy, Tufts University, Medford, USA

  Leon Gunther

• Laboratoire de Magnétisme Louis Néel, CNRS, Grenoble, France

  Bernard Barbara

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