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Spacer-dependent transport and magnetic properties of digital ferromagnetic heterostructures

Appl. Phys. Lett. 81, 4766 (2002); doi:10.1063/1.1528280

Issue Date: 16 December 2002

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T. C. Kreutz, G. Zanelatto, and E. G. Gwinn
Physics Department, University of California, Santa Barbara, California 93106

A. C. Gossard
Materials Department, University of California, Santa Barbara, California 93106
We examine the relationship between the transport and magnetic properties of digital ferromagnetic heterostructure superlattices in which 0.5 monolayer MnAs planes alternate with undoped GaAs spacer layers. The data show that as the thickness t of the GaAs spacers increases, charge transport and the Curie temperature both approach their independent-layer limits at comparable values of t. An increase in the per-layer conductivity with decreasing t accompanies a rise in TC. This behavior is consistent with an enhancement of interlayer ferromagnetic interactions by charge coupling across the spacers. ©2002 American Institute of Physics.
History: Received 3 September 2002; accepted 17 October 2002
Permalink: http://link.aip.org/link/?APPLAB/81/4766/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.70.Cn
    Magnetic properties and materials Magnetic properties of thin films, surfaces, and interfaces Interfacial magnetic properties (multilayers, superlattices)
  • 75.50.Dd
    Magnetic properties and materials Studies of specific magnetic materials Nonmetallic ferromagnetic materials
  • 75.50.Pp
    Magnetic properties and materials Studies of specific magnetic materials Magnetic semiconductors
  • 75.30.Kz
    Magnetic properties and materials Intrinsic properties of magnetically ordered materials Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
  • 75.60.Ej
    Magnetic properties and materials Domain effects, magnetization curves, and hysteresis Magnetization curves, hysteresis, Barkhausen and related effects
  • 75.30.Et
    Magnetic properties and materials Intrinsic properties of magnetically ordered materials Exchange and superexchange interactions
  • 73.63.-b
    Electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures Electronic transport in mesoscopic or nanoscale materials and structures
  • YEAR: 2002

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (15)
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