The dynamic properties of Cu (13.5 at. % Mn) spin‐glass films of various thicknesses have been investigated in a superconducting quantum‐interference device (SQUID) magnetometer. The films are produced in a dc‐sputtering system and fabricated in the form of multilayer samples. Utilizing zero‐field‐cooled magnetization and ac‐susceptibility measurements, the time‐dependent susceptibility has been probed over eight decades in time (10−4–104 s). Drastic changes of the dynamics are found upon varying the film thickness from 104 to 20 Å. The most significant feature is a crossover from a behavior typical for bulk spin glasses for the 104‐Å film, with a finite critical temperature and a critical slowing down that can be accurately described by a conventional power‐law divergence, to a slowing down for the very thin films that obeys a generalized Arrhenius law with a zero‐temperature critical point. Thus, these measurements indicate a crossover from three‐ to two‐dimensional spin‐glass dynamics when one spatial dimension is gradually diminished to a finite size.
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1 May 1990
Research Article|
May 01 1990
Dimensionality crossover in CuMn spin‐glass films
P. Granberg;
P. Granberg
Institute of Technology,Uppsala University, Box 534, S‐751 21 Uppsala, Sweden
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P. Nordblad;
P. Nordblad
Institute of Technology,Uppsala University, Box 534, S‐751 21 Uppsala, Sweden
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P. Svedlindh;
P. Svedlindh
Institute of Technology,Uppsala University, Box 534, S‐751 21 Uppsala, Sweden
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L. Lundgren;
L. Lundgren
Institute of Technology,Uppsala University, Box 534, S‐751 21 Uppsala, Sweden
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R. Stubi;
R. Stubi
Department of Physics and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824
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G. G. Kenning;
G. G. Kenning
Department of Physics and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824
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D. L. Leslie‐Pelecky;
D. L. Leslie‐Pelecky
Department of Physics and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824
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J. Bass;
J. Bass
Department of Physics and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824
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J. Cowen
J. Cowen
Department of Physics and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824
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P. Granberg
P. Nordblad
P. Svedlindh
L. Lundgren
R. Stubi
G. G. Kenning
D. L. Leslie‐Pelecky
J. Bass
J. Cowen
Institute of Technology,Uppsala University, Box 534, S‐751 21 Uppsala, Sweden
J. Appl. Phys. 67, 5252–5254 (1990)
Citation
P. Granberg, P. Nordblad, P. Svedlindh, L. Lundgren, R. Stubi, G. G. Kenning, D. L. Leslie‐Pelecky, J. Bass, J. Cowen; Dimensionality crossover in CuMn spin‐glass films. J. Appl. Phys. 1 May 1990; 67 (9): 5252–5254. https://doi.org/10.1063/1.344627
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