ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The interfacial coupling energy, Δσ for polycrystalline Ni0.8Fe0.2 (100 Å)/MnxPt1−x (t Å)/SiO2 bilayers, has been determined from wedge samples spanning a MnxPt1−x composition range 0.42〈x〈0.76 and t∼350 Å. Δσ exhibits a sharp peak of 0.1 erg/cm2 at 51% Mn. We compare the magnetic and microstructural properties of two bilayer films, which have the same compositions of permalloy and MnxPt1−x: [Ni0.85Fe0.15(100 Å)/Mn0.49Pt0.51(t Å)]. In one case (normal structure), the epitaxial permalloy was grown first onto Pt/MgO(001), followed by 170 Å of Mn0.49Pt0.51. In the other structure (inverted), a 350 Å thick polycrystalline film of Mn0.49Pt0.51 was grown onto a SiO2 substrate, followed by permalloy. The structures exhibited very different exchange bias fields (32 versus 86 Oe) and Δσ values (0.021 versus 0.060 erg/cm2), respectively. Significant differences in texture, grain size, and Mn0.49Pt0.51 layer thickness for the two samples are reported. © 1998 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.367815
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