@article{7ef01c83bc2649f0b81bbdc26230fabf,
title = "Structure Optimization of FePt-C Nanogranular Films for Heat-Assisted Magnetic Recording Media",
abstract = "Systematic investigations for the optimization of FePt-C nanogranular films for heat-assisted magnetic recording media are overviewed. FePt-C films prepared by using compositionally graded process exhibit binomial distribution of grains with a maximum size distribution of 16%. In addition, the average grain size of FePt could be controlled well below 7 nm. Easy-axis distribution can be substantially reduced by growing FePt-C layers on a single crystalline substrate instead of a (001)-textured MgO seed layer, indicating the improvement of (001) texture in the seed layer would reduce the in-plane component. Finite-element micromagnetic simulations incorporating experimentally determined misorientation of FePt grains do not reproduce the experimentally observed demagnetization curve, suggesting the presence of large distribution in the anisotropy fields of FePt grains. A typical growth model of the FePt-C nanogranular films has been proposed on the basis of the thickness-dependent microstructure of the FePt-C nanogranular films, and the suitability of various seed layers has been discussed. The observed results suggest that the suppression of the coarsening of FePt grains is essential to keep the grain size smaller than 6 nm.",
keywords = "Columnar growth, HAMR Media, Nanogranular films, easy axis distribution",
author = "H. Pandey and J. Wang and T. Shiroyama and Varaprasad, {B. S.D.Ch S.} and H. Sepehri-Amin and Takahashi, {Y. K.} and A. Perumal and K. Hono",
note = "Funding Information: TKB is supported by the British Society of Haematology and NHS Blood and Transplant. KF and CVG are supported by the Fund for Scientific Research-Flanders (FWO Vlaanderen, Belgium; G.0B17.13N) and by the Research Council of the University of Leuven (BOF KU Leuven‚ Belgium; OT/14/098). C.V.G is holder of the Bayer and Norbert Heimburger (CSL Behring) Chairs. The structured illumination microscope was acquired through a CLME grant from Minister Lieten to the VIB BioImaging Core, Leuven. J.H is supported by the Fund for Scientific Research-Flanders (FWO Vlaanderen, Belgium) grant no.1S00816N. AK and BJ are funded by the National Institute for Health Research (NIHR) Biomedical Research Centre (RG64245). MF is supported by the British Heart Foundation (BHF) Cambridge Centre of Excellence (RE/13/6/30180). The Ouwehand laboratory receives support from the BHF, Bristol-Myers Squibb, European Commission, MRC, NHS Blood and Transplant, Rosetrees Trust, the NIHR Biomedical Research Centre based at Cambridge University Hospitals NHS Foundation Trust, and the University of Cambridge. Funding Information: The NIHR BioResource – Rare Disease Study is a multicenter whole-genome sequencing (WGS) study of approximately 13,000 patients. The genotype and phenotype data are being incorporated in the 100,000 Genomes Project. This study makes use of data generated by the NIHR BioResource and a full list of investigators who contributed to the generation of the data is available from https://bioresource.nihr.ac.uk/rare-diseases/consortia-lists/. Funding for the project was provided by the NIHR (grant number RG65966). The NIHR BioResource projects were approved by Research Ethics Committees in the UK and appropriate national ethics authorities in non-UK enrollment centers. The authors are also grateful to all the research participants who donated their samples for this study and to Professor Andrew Mumford (University of Bristol, UK), Professor Michael Laffan (Imperial College London, UK), Dr Lining Guo (Metabolon Inc., Durham, NC, USA), and Dr Sergio Rodriguez-Cuenca and Professor Antonio Vidal-Puig from the University of Cambridge (UK) for their input. The Tg(cd41:EGF)11 line was a gift from Professor Leonard Zon (Hematology Division, Brigham and Women{\textquoteright}s Hospital, Boston, MA, USA). Publisher Copyright: {\textcopyright} 1965-2012 IEEE.",
year = "2016",
month = feb,
doi = "10.1109/TMAG.2015.2477313",
language = "English",
volume = "52",
journal = "IEEE Transactions on Magnetics",
issn = "0018-9464",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "2",
}