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

Abstract

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
Pages44-49
ISBN (Print)978-1-558-99898-8
Publication statusPublished - 2006
EventMagnetic Thin Films, Heterostructures, and Device Materials, April 18-20, 2006, San Francisco, CA, USA - San Francisco, CA, United States
Duration: 18 Apr 200620 Apr 2006
http://www.mrs.org/s06-program-q/

Publication series

NameMaterials Research Society Symposium Proceedings
Volume941
ISSN (Print)0272-9172

Conference

ConferenceMagnetic Thin Films, Heterostructures, and Device Materials, April 18-20, 2006, San Francisco, CA, USA
CountryUnited States
CitySan Francisco, CA
Period18/04/0620/04/06
OtherSymposium held at the 2006 MRS Spring Meeting
Internet address

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