Magnetic nanopatterns
were successfully created in FeRh thin film
deposited on MgO (100) substrates. Silica and polystyrene spherical
masks, nominally 500 and 1000 nm in diameter, respectively were applied
on the surface of the sample in order to locally shadow the film against
the effect of 110 keV energy neon-ion irradiation with fluences of
1015 and 1016 ions/cm2. Such nanosphere-lithography
technique allows for projecting the mask geometry on the magnetic
structure of the FeRh film. Conversion-electron Mössbauer spectroscopy
and magnetic force microscopy were used to determine the ferromagnetic
ratio and the magnetic pattern in the samples, and nuclear resonance
scattering of synchrotron radiation was applied to obtain the in-depth
magnetic profile. From the results obtained, the possible three-dimensional
(3D) structure of the created individual magnetic domains was also
constructed. Overall, the great customizability of the presented nanosphere-lithography
technique in FeRh thin film provides opportunities for developing
cutting-edge spintronic applications.
The effect of laser irradiation in the energy range from 20 mW to 200 mW was investigated in 109 nm thick Fe51Rh49 film deposited on an MgO (100) substrate. The initial, A1 structure with fully paramagnetic magnetic ordering was achieved after irradiating the samples with 120 keV Ne+ ions with a fluence of 1 × 1016 ion/cm2, as it was confirmed by conversion-electron Mössbauer spectroscopy. At higher powers physical damage of the layer was observed, while in the lowest power case, magnetic force microscopy revealed a well-defined magnetic structure reflecting the laser irradiation pattern. The presented results have the potential to be employed for laser ablation or allows the fabrication of arbitrary ferromagnetic pattern within a homogeneous paramagnetic FeRh thin films.
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