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Published Online: June 1998

Magnetic order and critical behavior at surfaces of ultrathin Fe(100)p(1×1) films on Pd(100) substrates

C. Rau, P. Mahavadi, and M. Lu
View Affiliations
  • Department of Physics and Rice Quantum Institute, Rice University, Houston, Texas 77251
Journal of Applied Physics 73, 6757 (1993); doi: http://dx.doi.org/10.1063/1.352476
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Thin filmsMagnetic filmsCurie pointIsing modelElectrodeposition
Abstract
The magnetic order and critical behavior at well‐defined surfaces of ultrathin (1.9–2.1) monolayer Fe(100)p(1×1) films, deposited at room temperature on atomically flat Pd(100) substrate crystals, is investigated using electron‐capture spectroscopy (ECS). Ferromagnetic order sets in at a surface Curie temperature TCs=613.1 K. At room temperature, the long‐ranged electron‐spin polarization (ESP) amounts to 34% and is oriented in‐plane for well‐annealed films. Near TCs, the ESP follows the power law (TCs−T)β, with a critical exponent β=0.125±0.01 evaluated near TCs. This result is in good agreement with the exact value β=1/8 of the two‐dimensional Ising model with short‐ranged forces. For temperatures far from TCs, the ESP follows precisely the temperature dependence of the magnetization as predicted by Yang’s exact solution of the two‐dimensional Ising model including long‐ranged forces.

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