Self-Stabilized Carbon-L10 FePt Nanoparticles for Heated Dot Recording Media

Title
Self-Stabilized Carbon-L10 FePt Nanoparticles for Heated Dot Recording Media
Authors
채근화Rohit MedwalSanjeev GautamSurbhi GuptaKandasami AsokanGulam Roshan DeenRajdeep Singh RawatRam Singh KatiyarSubramanian Annapoorni
Keywords
Hard magnetic materials; heated dot magnetic recording; FePt
Issue Date
2018-05
Publisher
IEEE Magnetics Letters
Citation
VOL 9-5504105
Abstract
Heated dot magnetic recording (HDMR) technology promises to achieve ultrahigh storage density well above 4 Tb/in(2) by making use of L1(0) FePt bimetallic islands HDMR media require the development of thermally stable, noninteracting magnetic patterns to circumvent the signal noise and writability challenges We prepared self-stabilized carbon-L1(0) FePt nanoparticles (NPs) with average diameter of about 7.2 nm for the HDMR media FePt NPs synthesized by chemical reduction using oleic acid and oleylamine transform to the carbon-L1(0) FePt phase with optimized heat treatment at 873 K. The high-temperature annealing not only helps to achieve the desired L1(0) phase but also helps in the formation of a carbon coating on the FePt NPs due to degradation of the organic cap We investigated the effect of carbon coating on the electronic states of Fe using X-ray absorption measurements and corroborated with high-resolution transmission electron microscopy and Fourier-transform infrared spectroscopy X-ray magnetic circular dichroism reveals the presence of magnetocrystalline anisotropy in the carbon-L1(0) FePt NPs, which is also supported by the structural and magnetic measurements A magnetization-field loop at 300 K shows high coercivity of approximate to 1.6 T. The synthesized carbon-L1(0) FePt NPs can be used as FePt islands and should be suitable for high-density HDMR media.
URI
https://pubs.kist.re.kr/handle/201004/68437
ISSN
1949-307X
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE