Magnetic imaging using geometrically constrained nano-domain walls

Nanoscale
Héctor Corte-LeónOlga Kazakova

Abstract

Magnetic nanostructures, as part of hybrid CMOS technology, have the potential to overcome silicon's scaling limit. However, a major problem is how to characterize their magnetization without disturbing it. Magnetic force microscopy (MFM) offers a convenient way of studying magnetization, but spatial resolution and sensitivity are usually boosted at the cost of increasing probe-sample interaction. By using a single magnetic domain wall (DW), confined in a V-shape nanostructure fabricated at the probe apex, it is demonstrated here that the spatial resolution and the magnetic sensitivity can be decoupled and both enhanced. Indeed, owing to the nanostructure's strong shape anisotropy, DW-probes have 2 high and 2 low magnetic moment states with opposite polarities, characterised by a geometrically constrained pinned DW, and curled magnetization, respectively. Electron holography studies, supported by numerical simulations, and in situ MFM show that the DW-probe state can be controlled, and thus used as a switchable tool with a low/high stray field intensity.

References

Aug 29, 2009·Nanotechnology·Marco DonolatoRiccardo Bertacco
Apr 2, 2010·ACS Applied Materials & Interfaces·Humberto CampanellaJosé A Plaza
Sep 21, 2013·Ultramicroscopy·Alexander AlekseevNikolay Djuzhev
Aug 15, 2014·Scientific Reports·Héctor Corte-LeónOlga Kazakova
Jan 15, 2015·Nanotechnology·Marián PrecnerVladimír Cambel
Apr 14, 2016·Scientific Reports·Yurii P IvanovJürgen Kosel
Aug 23, 2016·Beilstein Journal of Nanotechnology·Óscar Iglesias-FreireAgustina Asenjo
Aug 5, 2017·Scientific Reports·Vishal PanchalOlga Kazakova

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Citations

Sep 27, 2019·Materials·Nives StrkaljMorgan Trassin
Oct 28, 2021·Advanced Materials·Denys MakarovOleksandr V Dobrovolskiy

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Methods Mentioned

BETA
AFM
electron holography

Software Mentioned

OOMMF
CEOS

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