Effects of substitution on the exchange stiffness and magnetization of Co films
2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 90, no 23, 235408- p.Article in journal (Refereed) Published
An antiferromagnetically coupled FM/NM/FM (FM = ferromagnet, NM = normal metal) trilayer structure responds to an external magnetic field by the formation of a magnetic-moment spring within the FM layers. We show that the exchange stiffness (A ex) of an FM layer can be determined by fitting the field-dependent magnetization, M(H), of the FM/NM/FM trilayer to a micromagnetic model. Using this method, we have measured the exchange stiffness of thin-film Co alloyed with Cr, Fe, Ni, Pd, Pt, and Ru. The results show that the rate at which a substituent element reduces the exchange stiffness is not directly related to its effect on the magnetization of the alloy. The observed trends have been understood by material-specific modeling based on density functional theory within the local density approximation. The stiffness measurements are in agreement with Brillouin light scattering carried out on thicker Co films.
Place, publisher, year, edition, pages
2014. Vol. 90, no 23, 235408- p.
IdentifiersURN: urn:nbn:se:uu:diva-239091DOI: 10.1103/PhysRevB.90.235408ISI: 000348846500002OAI: oai:DiVA.org:uu-239091DiVA: diva2:775930