Microstructure and Magnetic Properties of FePt-MO$_{\rm x}$ Granular Films

Nitrogen plasma treatment in two-step temperature deposited FePt bilayer media

“…These include the control of grain sizes by addition of impurities, use of underlayers for epitaxial growth of L10 FePt (001) at reduced temperatures, graded media etc. [6][7][8][9][10][11][12][13][14][15][16] Exchange coupled composite (ECC) bilayer structures such as FePt/FeRh, Fe/FePt, FePt:C/Fe have also been studied to tailor the switching field of FePt media [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. We have previously demonstrated that the magnetic as well as the topographical properties of FePt media can be tailored suitably by two-step temperature deposition of FePt bilayer [31,32].…”

Influence of MgO underlayers on the structure and magnetic properties of FePt-C nanogranular films for heat-assisted magnetic recording media

“…This failure is considered to be due to dissolution of the segregants in the FePt grains. 19 Compared with these oxide segregants, the FePt-C system has a much higher coercivity. 18 In addition, it shows excellent grain isolation with a small size distribution in the planer direction, which is the essential feature for the recording media application.…”

MgO-C interlayer for grain size control in FePt-C media for heat assisted magnetic recording

“…Highly textured (001) continuous polycrystalline MgO thin film layers have been the choice of the underlayer for the granular FePt-X layer, where X has been either carbon or an oxide. [3][4][5] One important reason is the lattice epitaxy relationship between the MgO and FePt. The slightly larger MgO lattice constant compared with that of the FePt yields a stretching tensile strain to the FePt grain, 6 promoting ordering in the perpendicular direction in particular when FePt is deposited at sufficiently high temperature, ∼ 600 • C. 7 The FePt grains usually do not have one-to-one grain matching with that of the MgO layer.…”