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Dimensionality and confinement effects in δ-doped Pd(Fe) layers.

Evangelos Th Papaioannou1, Vassilios Kapaklis, Andrea Taroni

  • 1Department of Physics and Astronomy, Materials Physics Division, Uppsala University, Box 516, 751 20 Uppsala, Sweden.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
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Magnetic ordering in iron-doped palladium structures shows dimensional crossover. This behavior, observed using magneto-optic Kerr measurements, is linked to temperature-dependent magnon modes, indicating lower dimensionality at low temperatures.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Investigating magnetic ordering in dilute magnetic alloys like iron-doped palladium (Pd(Fe)) is crucial for understanding their electronic and magnetic properties.
  • Dilute magnetic systems offer unique opportunities to study fundamental magnetic phenomena at reduced dimensions.

Purpose of the Study:

  • To explore the dimensionality aspects of magnetic ordering in δ-doped palladium-iron (Pd(Fe)) structures.
  • To investigate the temperature dependence of magnetization induced by iron in palladium from 5 K to 300 K.
  • To understand the dimensional crossover and its relationship with magnetic excitations.

Main Methods:

  • Magneto-optic Kerr measurements were employed to probe the induced magnetization.
  • Temperature-dependent studies were conducted over a wide range (5 K < T < 300 K).
  • Analysis involved considering the temperature dependence of magnon modes.

Main Results:

  • A dimensional crossover in magnetic ordering was observed in the δ-doped Pd(Fe) structures.
  • The dimensionality at low temperatures and in the critical region was found to differ.
  • This crossover could not be solely explained by structural factors.

Conclusions:

  • The observed dimensional crossover is primarily governed by the temperature dependence of magnon modes.
  • Lower dimensionality is established at lower temperatures due to these magnon modes.
  • The findings provide insights into the interplay between dimensionality, temperature, and magnetic ordering in dilute magnetic systems.