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Determination of Exchange and Rotatable Anisotropies in Co₂FeSi/IrMn Exchange Coupled Structures using Broadband Ferromagnetic Resonance

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Głowiński H., Schmidt M., Krysztofik A., Gościańska I., Dubowik J.

Acta Physica Polonica A

2015

vol. 127

issue 2

531-533

We determined exchange H_{ex} and rotatable H_{rot} anisotropy fields of multilayers that comprise 10 nm Co₂FeSi (CFS) layers exchange coupled to 20 nm IrMn layers by using ferromagnetic resonance with a vector network analyzer (VNA-FMR). The multilayer structures consist of IrMn/bottom (b)-CFS/IrMn/middle (m)-CFS/IrMn/top (t)-CFS/IrMn layers so that each CFS layer is surrounded by a pair of IrMn layers. In the structures, the exchange bias field propagates in such a way that H_{ex}^{t} > H_{ex}^{m} > H_{ex}^{b} for the top, middle, and bottom layer, respectively. FMR response measured along the exchange bias (EB) axis consist of only two absorptions related to the (b+m)- and (t)-CFS layers, respectively. Exchange and rotatable anisotropy determined independently from angular and dispersion measurements of the resonance fields are nearly the same. Rotatable anisotropy field scales with the exchange bias field in these complex structures.

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1 Acta Physica Polonica A

1 2015

1 Dubowik J.

1 Gościańska I.

1 Głowiński H.

1 Krysztofik A.

1 Schmidt M.

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Determination of Exchange and Rotatable Anisotropies in Co₂FeSi/IrMn Exchange Coupled Structures using Broadband Ferromagnetic Resonance