Onset of exchange anisotropy in epitaxial fct-cobalt(001)/fct- manganese(001) bilayers

J.T. Kohlhepp, H. Wieldraaijer, W.J.M. Jonge, de

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review


Manganese (Mn) grows in a meta-stable expanded (c/a > 1) face-centered-tetragonal (fct) phase on thin fct-Co(001) template films. For small Mn thicknesses a close to a layer-by-layer growth is observed. Antiferromagnetism (AFM) of fct-Mn is evidenced by the observation of shifted magnetization loops antiparallel to the cooling field direction (negative bias) and enhanced coercive fields for Co/Mn bilayers. At low temperatures magnetic Co/Mn interface exchange interactions are detected for nominal Mn thicknesses as low as 1.3 monolayer (ML), indicating the onset of AFM in 2 ML thick Mn islands. However, between 2 ML and 5 ML Mn a positive bias of the magnetization loops is observed in a certain temperature range below the blocking temperature (TB) of the films. This peculiar behavior is explained by the dependence of TB on both the local Mn ML thickness and the Mn island size, leading to a unidirectional coercivity enhancement in a temperature range where both blocked and unblocked regions are coexisting in the Mn layers. © 2006 Materials Research Society.
Original languageEnglish
Title of host publicationMagnetic thin films, heterostructures and device materials : MRS spring meeting April 17 - 21, 2006, San Francisco, California, USA
Place of PublicationWarrendale, Pa.
PublisherMaterials Research Society
ISBN (Print)978-1-558-99898-8
Publication statusPublished - 2006
Event2006 MRS Spring Meeting & Exhibit - San Francisco, United States
Duration: 17 Apr 200621 Apr 2006

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Conference2006 MRS Spring Meeting & Exhibit
Country/TerritoryUnited States
CitySan Francisco
OtherSymposium held at the 2006 MRS Spring Meeting
Internet address


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