Investigation of particle formation and superstructure development in FePt nanoparticles and their effect on magnetic properties

Inductive magnetization of low-temperature ordered L10-FePt with CoAg underlayer

“…This indicates that the cause of reducing necessary ordered temperature is mainly the external magnetic field, although Ag could be used to lower the necessary temperature. 8,9,16 B. The microstructures Figure 3 shows the TEM bright-field image of the aged CoAg film with film thickness of 20 nm.…”

“…Recently, several attempts have been made to reduce the process temperature; such as the introduction of underlayers, 3 the addition of third elements, 4 ion irradiation, 5 multilayering, 6 and deposition under annealing. 7 Platt et al 8 and Huang et al 9 proposed that Ag not only decreases ordering temperature but also increases coercivity. Petit et al proposed that for pure Co nanocrystals, different film morphologies are obtained through application of a magnetic field during deposition.…”

Microstructural and magnetic properties of CoPt nanowires

“…FePt and CoPt nanoparticles have been prepared previously from sputtered multilayer precursors subjected to thermal annealing [2] and also by wet chemical techniques [3][4][5][6][7][8][9]. CoPt/FePt nanoparticulate films made by sputtering have also been investigated for perpendicular magnetic recording, since they decrease the transition noise and enhance the areal density of magnetic recording media [10].…”

Enhanced magnetic properties of FePt nanoparticles codeposited on Ag nanoislands

“…6͒ or thermal annealing. 7,8 More recently, introducing immiscible metallic additives, such as Au, Cu, and Ag, [9][10][11][12][13][14] has been shown to promote the ordering transformation at lower T s , by providing a decrease in the activation energy. 10 Until now, this concept has been demonstrated only on nanoparticles 9,11,12,14 synthesized with chemical methods on thin films 10 and on multilayer structures.…”