Fabrication and high‐resolution electron microscopy study of FePt L10/A1 graded exchange spring media. Issue 7 (22nd April 2013)

• Record Type: Journal Article
• Authors: Lee, Jehyun; Dymerska, Barbara; Fidler, Josef; Alexandrakis, Vasilis; Speliotis, Thanassis; Niarchos, Dimitris; Pongratz, Peter; Suess, Dieter
• Is Part Of: Physica status solidi. Volume 210:Issue 7(2013:Jul.)
• Page Start: 1305
• Page End: 1310
• Publication Date: 2013-04-22
• Subjects: Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201228731
• Languages: English
• ISSNs: 1862-6300

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="pssa201228731-sec-0001" sec-type="section"> <p>We have prepared FePt L1₀/A1 exchange spring graded media by controlling deposition temperature. The performance of the media was determined by the deposition conditions, particularly the cooling rate. By varying the deposition conditions a coercivity of 4.0 kOe was achieved without loss in remanent magnetization, the value corresponds to 88% reduction compared with that of FePt L1₀ single phase (32.2 kOe). High‐resolution transmission electron microscopy (HRTEM) investigations have revealed that this drastic coercivity reduction originates from the unique microstructure of the specimens: coexistence of the L1₀ and A1 phases at the interphase boundary. In this region the two phases are dispersed one into another like inclusions in a matrix. Finally, the role of the complicated phase boundary on switching field reduction was discussed using micromagnetic simulations. <inline-graphic xlink:href="ark:/27927/pgg277v25sp" content-type="pssa201228731-gra-0001" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></p> </sec> </abstract>