Recipe for High Moment Materials with Rare-earth and 3d Transition Metal Composites
2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, 29307Article in journal (Refereed) PublishedText
Materials with high volume magnetization are perpetually needed for the generation of sufficiently large magnetic fields by writer pole of magnetic hard disks, especially for achieving increased areal density in storage media. In search of suitable materials combinations for this purpose, we have employed density functional theory to predict the magnetic coupling between iron and gadolinium layers separated by one to several monolayers of 3d transition metals (Sc-Zn). We demonstrate that it is possible to find ferromagnetic coupling for many of them and in particular for the early transition metals giving rise to high moment. Cr and Mn are the only elements able to produce a significant ferromagnetic coupling for thicker spacer layers. We also present experimental results on two trilayer systems Fe/Sc/Gd and Fe/Mn/Gd. From the experiments, we confirm a ferromagnetic coupling between Fe and Gd across a 3 monolayers Sc spacer or a Mn spacer thicker than 1 monolayer. In addition, we observe a peculiar dependence of Fe/Gd magnetic coupling on the Mn spacer thickness.
Place, publisher, year, edition, pages
2016. Vol. 6, 29307
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:uu:diva-300040DOI: 10.1038/srep29307ISI: 000379185100001PubMedID: 27381456OAI: oai:DiVA.org:uu-300040DiVA: diva2:950779
FunderCarl Tryggers foundation , CTS 12:419 13:413