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High Resolution Tips for Switching Magnetization MFM

100%

Precner M., Fedor J., Tóbik J., Šoltýs J., Cambel V.

Acta Physica Polonica A

2014

vol. 126

issue 1

386-387

Switching magnetization magnetic force microscopy (SM-MFM) is based on two-pass magnetic force microscopy with opposite orientation of tip magnetization between two scans. The sum of the scanned data with reversed tip magnetization depicts local van der Waals forces, and their difference maps the local magnetic forces. Tip magnetization can be easily reversed in external magnetic field during the scanning. The separation of the forces mapped enables scanning in close proximity of the sample (~5 nm). Therefore, extremely high spatial resolution (10 nm) is achievable by the SM-MFM. Image phase resolution of the MFM method depends on various geometric parameters of the tip, such as tip length, its apex radius and taper angle. The parameters are determined by the evaporation process, within which the standard atomic force microscopy tips are coated with magnetic layer. In this work we show that the thickness of the coated layer is important for the SM-MFM spatial resolution.

Vortex Dynamics in Ferromagnetic Nanoelements Observed by Micro-Hall Probes

73%

Ščepka T., Šoltýs J., Precner M., Fedor J., Tóbik J., Gregušová D., Gucmann F., Kúdela R., Cambel V.

Acta Physica Polonica A

2014

vol. 126

issue 1

390-391

In this work we measure the nucleation and annihilation of magnetic vortices in Pacman-like (PL) micromagnets prepared from Permalloy (Ni_{81}Fe_{19}, Py) at 77 K. Lateral dimensions of explored objects are ≤1 μm with thickness of about 40 nm. The micromagnets are located directly on the high-sensitive micro-Hall probe based on GaAs/AlGaAs heterostructure by lift-off process. Experiments show good agreement of the magnetization reversal with the micromagnetic simulation. Other shapes of micromagnets are also considered to obtain more precise picture of the vortex dynamics.

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2 Acta Physica Polonica A

2 2014

2 Cambel V.

2 Fedor J.

2 Precner M.

2 Tóbik J.

2 Šoltýs J.

1 Gregušová D.

1 Gucmann F.

1 Kúdela R.

1 Ščepka T.

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High Resolution Tips for Switching Magnetization MFM

Vortex Dynamics in Ferromagnetic Nanoelements Observed by Micro-Hall Probes