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Characterization of L10-FePt/Fe based exchange coupled composite bit pattern media
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Out of plane hysteresis loops of the (a) continuous films and (b) patterned films with different structures.

Image of FIG. 2.
FIG. 2.

TEM cross-sectional images of patterned media with structure of (a) FePt(4 nm), (b) FePt(4 nm)/Fe(4 nm), and (c) FePt(4 nm)/Fe(6 nm). (d) SEM plan-view image of the FePt(4 nm)/Fe(6 nm) bit patterned sample. The pillar size is 31 nm with a distribution of 8%.

Image of FIG. 3.
FIG. 3.

(Color online) (a) DCD curve obtained from MFM images of FePt(4 nm)/Fe(4 nm) ECC patterned sample and MFM images with different remanent states: after applied reverse field (b) −1 kOe, (c) −6 kOe, and (d) −9 kOe, respectively. The DCD curve was plotted by counting the number of the reversed magnetic islands under different remanent states from MFM images.

Image of FIG. 4.
FIG. 4.

The dependences of thermal barrier and gain factor on the thickness of Fe layer. For the samples of FePt(4 nm), FePt(4 nm)/Fe(4 nm) and FePt(4 nm)/Fe(6 nm), the thermal barriers are 180 kBT, 210.5 kBT, and 192 kBT, respectively, and the gain factors are 1.1, 1.57, and 1.28, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Characterization of L10-FePt/Fe based exchange coupled composite bit pattern media