Single Domain Switching Investigated Using Telegraph Noise Spectroscopy: Possible Evidence for Macroscopic Quantum Tunneling

F. Coppinger; J. Genoe; D. K. Maude; Ulf Gennser; J. C. Portal; K. E. Singer; P. Rutter; T. Taskin; A. R. Peaker; A. C. Wright

doi:10.1103/PhysRevLett.75.3513

Single Domain Switching Investigated Using Telegraph Noise Spectroscopy: Possible Evidence for Macroscopic Quantum Tunneling

F. Coppinger, J. Genoe, D. K. Maude, Ulf Gennser, J. C. Portal, K. E. Singer, P. Rutter, T. Taskin, A. R. Peaker, and A. C. Wright

Phys. Rev. Lett. 75, 3513 – Published 6 November 1995

Abstract

Telegraph noise, i.e., two-level fluctuations (TLF), in the magnetoresistance of Er-doped GaAs has been used to probe the magnetic moment of the small ErAs clusters formed during the molecular beam epitaxy growth process. At high temperatures the TLF are thermally activated but below 350 mK tunneling of the magnetization dominates.

Received 6 April 1995

DOI:https://doi.org/10.1103/PhysRevLett.75.3513

Authors & Affiliations

F. Coppinger^1,2, J. Genoe¹, D. K. Maude¹, Ulf Gennser¹, and J. C. Portal^1,2

¹High Magnetic Field Laboratory-Centre National de la Recherche Scientifique, BP 166, 38042 Grenoble, France
²Institut National des Sciences Appliquées, 31077 Toulouse, France

K. E. Singer, P. Rutter, T. Taskin, A. R. Peaker, and A. C. Wright

Department of Electrical Engineering and Electronics and Centre for Electronic Materials, University of Manchester Institute of Science and Technology, Sackville Street, Manchester, M60 1QD, United Kingdom