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Dimensionality crossover in CuMn spin-glass films (1990)

Granberg, P. ; Nordblad, P. ; Svedlindh, P. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 67 (1990), S. 5252-5254

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: 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 A(ring). The most significant feature is a crossover from a behavior typical for bulk spin glasses for the 104-A(ring) 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.344627

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Digitale Medien

Magnetic measurements on electrochromic Ni-oxide-based films (1997)

Ragan, D. D. ; Svedlindh, P. ; Granqvist, C. G.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 82 (1997), S. 1759-1762

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Electrochromic Ni-oxide-based films were prepared by cathodic electrodeposition and, for comparison, also by reactive sputtering. The films were characterized by cyclic voltammetry, spectrophotometry, and infrared absorption spectroscopy. Explorative magnetic measurements, performed at low temperatures using SQUID technology, exhibited a well-defined Curie–Weiss behavior with a transition temperature that was depressed by proton extraction. © 1997 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.365977

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