Magnetic coupling dependence on MgO interlayer thickness of FePt multilayered dots

L10-ordered FePt (001) circular dot arrays with the FePt/MgO/FePt multilayered structure have been prepared and the relationship between the magnetic properties and the size of the dots or the MgO intermediate layer thickness has also been investigated. The dots were microfabricated from continuous...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2017-05, Vol.56 (5), p.55504
Main Authors: Makuta, Hirokazu, Iwama, Hiroki, Shima, Toshiyuki, Doi, Masaaki
Format: Article
Language:English
Subjects:
Dependence
Electron beam lithography
Hysteresis loops
Interlayers
Intermetallic compounds
Iron compounds
Magnesium oxide
Magnetic properties
Magnetism
Magnetization reversal
Multilayers
Platinum compounds
Thickness
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Summary:L10-ordered FePt (001) circular dot arrays with the FePt/MgO/FePt multilayered structure have been prepared and the relationship between the magnetic properties and the size of the dots or the MgO intermediate layer thickness has also been investigated. The dots were microfabricated from continuous films by electron beam lithography and Ar ion milling. The remarkable steps in the hysteresis loops for multilayer films with tMgO = 3, 5, 8, and 10 nm indicated individual magnetization reversal of the top and bottom FePt layers. In the dots with tMgO = 3-8 nm, the step in the definition curves was not observed for D = 0.3 µm . When tMgO = 10 nm, remarkable step were observed not only for D = 0.5-3 µm but also for D = 0.5 µm .
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.56.055504