Effect of topological bumpy surface underlayer on compositionally modulated atomic layer stacking for high Ku Co80Pt20 film with closed-packed orientation

K. Tham, S. Hinata, S. Saito

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Recently, closed-packed orientation CoPt-based alloys with oxides granular films have been studied as a candidate for the first generation microwave assisted magnetic recording (MAMR) media1-2). For granular films, it is well known that the CoPt magnetic grains grown on a bumpy surface underlayer have a columnar structure and separated with oxides at the grain boundaries. To increase thermal stability of the grains, the enhancement of uniaxial magneto-crystalline anisotropy (Ku) of the grains is indispensable. In general, to further increase Ku of a CoPt-based alloy grains, increasing the spin-orbital interaction is thought to be effective. One way to achieve this is by forming a compositionally modulated atomic layer stacking structure3-4). In this structure in-plane-disordered atomic layers of each composition are aligned parallelly to the substrate normal. Therefore, the authors consider the realization of such structure on a bumpy surface underlayer will be a big challenge. In this paper, we will discuss about the effect of the bumpy surface including surface roughness and grain size of the underlayer on compositionally modulated atomic layer stacking of overlying Co80Pt20 film in relation with Ku.

Original languageEnglish
Title of host publication2015 IEEE International Magnetics Conference, INTERMAG 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479973224
DOIs
Publication statusPublished - 2015 Jul 14
Event2015 IEEE International Magnetics Conference, INTERMAG 2015 - Beijing, China
Duration: 2015 May 112015 May 15

Publication series

Name2015 IEEE International Magnetics Conference, INTERMAG 2015

Other

Other2015 IEEE International Magnetics Conference, INTERMAG 2015
CountryChina
CityBeijing
Period15/5/1115/5/15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Surfaces, Coatings and Films

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