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Exchange anisotropy of polycrystalline bilayers enlarged by long-time annealing
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Image of FIG. 1.
FIG. 1.

Changes of of bilayers annealed at various temperature, , as a function of the Mn–Ir layer thickness. Annealing duration was fixed at . Curves are guides for eye.

Image of FIG. 2.
FIG. 2.

Magnetization curves of bilayers annealed at . Annealing duration, , was (dashed), (dotted dashed), and (solid line).

Image of FIG. 3.
FIG. 3.

Changes of of bilayers annealed at as a function of cumulative annealing duration, . Curves are the fitted calculation, based on the single spin ensemble model.

Image of FIG. 4.
FIG. 4.

Conventional x-ray diffraction profiles (a) and grazing incident x-ray diffraction profiles (b) of bilayer, before (top) and after (bottom) thermal annealing at , . Asterisks index the diffraction peaks from silicon substrate.

Image of FIG. 5.
FIG. 5.

Schematic illustration of the single spin ensemble model for the AFM spins in FM/AFM bilayer and total free energy of AFM grains as a function of the angle of the AFM spin direction. While the bilayer includes huge number of AFM grains, only two AFM grains were illustrated as cylinders, for example. Black colored single-headed arrows indicate the surface spin of AFM grains, facing to the FM layer. Small springs labeled indicate the interfacial coupling strength. Double-headed arrows at the bottom of cylinders indicate the magnetic anisotropy axis of AFM grains, . The axis of each AFM grain is randomly oriented in the film plane.


Generic image for table
Table I.

Respective values of the fitting parameters, , , , , and , used for the calculation of the curves in Fig. 3.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Exchange anisotropy of polycrystalline Mn–Ir∕Co–Fe bilayers enlarged by long-time annealing