Investigation of Ultra-Thin Iron Films

  • C. E. Violet
  • E. L. Lee

Abstract

Ultra-thin ferromagnetic films prepared by vacuum evaporation are subject to two effects that can have a profound influence on experimental observations. First, the films tend to oxidize; for example, for an oxygen partial pressure of 10−6 torr at room temperature a monatomic layer of oxygen may form in as short a time as 1 sec. Second, if the film deposition is interrupted at an early stage, it may have an island structure. If the typical island volume V is such that KV, the anisotropy energy, is of the order of or less than kT, the island will be superparamagnetic. This implies that the magnetization vector M S V, where M S is the saturation magnetization, will undergo a kind of Brownian rotation with a relaxation time that may be short relative to the measurement time. Both of these effects will tend to simulate a decreased saturation magnetization and Curie temperature [1].

Keywords

Curie Temperature Hyperfine Field Metallic Iron Brownian Rotation Island Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1966

Authors and Affiliations

  • C. E. Violet
    • 1
  • E. L. Lee
    • 1
  1. 1.Lawrence Radiation LaboratoryUniversity of CaliforniaLivermoreUSA

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