Two-dimensional Induced Ferromagnetism

Abstract

Magnetic properties of materials confined to nanometer length scales are providing important information regarding low dimensional physics. Using gadolinium based Langmuir-Blodgett films, we demonstrate that two-dimensional ferromagnetic order can be induced by applying magnetic field along the in-plane (perpendicular to growth) direction. Field dependent exchange coupling is evident in the in-plane magnetization data that exhibit absence of hysteresis loop and show reduction in field required to obtain saturation in measured moment with decreasing temperature.

4 pages, 3 postscript figures, corrected paper format

References in corpus (4)

• Absence of spontaneous magnetic order at non-zero temperature in one- and two-dimensional Heisenberg and XY systems with long-range interactions
• Dipolar interaction between two-dimensional magnetic particles
• Phase transition in a 2-dimensional Heisenberg model
• Ferromagnetism of ${}^3$He Films in the Low Field Limit