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18 September 2018 Domain width model for perpendicularly magnetized systems including DMI (Conference Presentation)
Matthias Kronseder, Christian H. Back, Thomas Norbert Gerhard Meier
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Proceedings Volume 10732, Spintronics XI; 107323F (2018) https://doi.org/10.1117/12.2320989
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States
Abstract
In ultrathin ferromagnetic films with perpendicular anisotropy a spin-reorientation transition from out-of-plane to in-plane orientation of the magnetization vector may occur. The competition of exchange and anisotropy energy on the one hand and the dipole interaction on the other hand leads to the formation of stripe domain patterns in the vicinity of the spin reorientation transition. Recently a strong Dzyaloshinskii-Moriya interaction (DMI) was found in various perpendicularly magnetized multilayer systems due to symmetry breaking at interfaces. The dependence of the stripe domain width on the DMI is theoretically and experimentally investigated. A domain spacing model applicable in the normal stripe domain phase is developed describing the dependence of the stripe domain width on the magnetic properties of the sample. We present a new approach to determine the magnitude of the DMI-constant by fitting the stripe domain width as a function of the effective perpendicular anisotropy on wedge-shaped samples with the model. By applying this method to the domain pattern of several ultrathin multilayer samples based on Ni/Fe/Cu(001) imaged by TP-MCD-PEEM the magnitude of the DMI of the FeNi- and NiFe-interfaces is determined. Furthermore we show that the DMI in Ni/Fe/Cu(001) can be considerably enhanced by adding an overlayer of platinum to the sample stack.
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Matthias Kronseder, Christian H. Back, and Thomas Norbert Gerhard Meier "Domain width model for perpendicularly magnetized systems including DMI (Conference Presentation)", Proc. SPIE 10732, Spintronics XI, 107323F (18 September 2018); https://doi.org/10.1117/12.2320989
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KEYWORDS
Systems modeling
Anisotropy
Multilayers
Statistical modeling
Ferromagnetics
Interfaces
Magnetism
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