Open AccessMacroscopic Quantum Effects in Single Crystal Dy (Fe0.8Al0.2)2
Author(s) -
钟文定,
陈海英,
刘尊孝,
吴建华,
李国忠
Publication year - 1999
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.48.204
Subject(s) - condensed matter physics , coercivity , quantum tunnelling , demagnetizing field , single crystal , materials science , quantum , thermal , viscosity , crystal (programming language) , single domain , magnetization , physics , magnetic domain , thermodynamics , magnetic field , nuclear magnetic resonance , quantum mechanics , computer science , programming language
The temperature dependence of demagnetization curve, intrinsic coercivity and magnetic viscosity has been measured on single crystal Dy (Fe0.8Al0.2)2 in [100], [110] and [111] directions. The staircase and a large jump of demagnetization curve, an obvious peak of coercivity vs temperature, and the magnetic viscosity being independent of the temperature etc., were observed. The observed features were analyzed within the theory of the macroscopic quantum effects for domain walls tunneling in the single crystal. A crossover temperature has been observed at Tcr=5.5K between classical thermal activation and quantum tunneling regimes.