Cu interfaced Fe/Pt multilayer with improved (001) texture, enhanced L10 transformation kinetics and high magnetic anisotropy

Atomic level mechanism of disorder-order transformation kinetics at nanoscale in FePt based systems

“…While for S3, only (110) reflection appears to be textured out of the film plane. It is noteworthy that outof-plane texturing of (001) grain was observed at the onset of L1 0 ordering in previously published reports, where Cu is interfaced between Fe and Pt in multilayer structure and the films were processed using conventional annealing [6]. Similar results were also obtained for the Fe/Pt multilayer.…”

“…Post deposition treatments of the FCC phase are required to obtain the L1 0 ordered FCT phase. Moreover, structural and magnetic properties of L1 0 ordered FePt sensitively depend on the relative concentration of Fe and Pt, approaches of synthesis, post-deposition treatments, film structure in an as-deposited state, etc [6][7][8][9][10][11]. Therefore, wide research interest is directed at the optimization of structural and magnetic properties of FePt by synthesizing FePt films in diverse structures via various synthesis routes [12][13][14].…”

“…Some of the key factors that influence the disorder-order transformation kinetics in FePt films are as follows: Recent experimental findings demonstrated that the addition of Cu causes lattice distortion favoring the L1 0 transformation and (001) texturing in the films [15,16]. Moreover, due to the high enthalpy of mixing for Fe and Cu [17], the composition and configuration in which Cu is added to FePt have a huge impact on these properties [6,18,19].…”

Synthesis of highly ordered L10 MPt alloys (M = Fe, Co, Ni) from crystalline salts: an in situ study of the pre-ordered precursor reduction strategy

“…18,32,36 Among the different strategies proposed to promote the ordering process, 37–40 the use of pre-ordered structures has been demonstrated to be highly efficient, being however mainly limited to thin film systems, where the kinetics of formation is enhanced by alternating deposition of monoatomic layers of the two elements. 41–44…”

“…18,32,36 Among the different strategies proposed to promote the ordering process, [37][38][39][40] the use of pre-ordered structures has been demonstrated to be highly efficient, being however mainly limited to thin film systems, where the kinetics of formation is enhanced by alternating deposition of monoatomic layers of the two elements. [41][42][43][44] Following this concept, the authors of the present paper have recently developed an effective, single-step, easily scaledup synthesis route, called pre-ordered precursor reduction (PPR), 45,46 which exploits the intrinsic order of crystalline precursor salts mimicking the alternate structure of the ordered alloy, 11,[47][48][49] to synthesize highly-ordered L1 0 binary alloys by simple thermal treatment in the reductive atmosphere. Starting from M(H 2 O) 6 PtCl 6 precursor salts (M = Fe, Co, Ni), a systematic work, by means of X-ray diffraction, transmission electron microscopy and magnetometry, was performed to study the PPR synthesis of highly ordered FePt, CoPt and NiPt nanoparticle alloys, the latter being extremely challenging due to their low 45 which results in a smaller driving force for ordering.…”