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NANOSENSORS AFM probes for Magnetic Force Microscopy

Did you know that NANOSENSORS offers six different types of AFM probes for Magnetic Force Microscopy ( MFM) for scanning and investigating sample surfaces with magnetic features?

PPP-MFMR – AFM tip with hard magnetic coating, sensitivity, resolution and coercivity designed for standard magnetic force microscopy applications

PPP-LM-MFMR – designed for magnetic force microscopy with reduced disturbance of the magnetic sample by the MFM tip and enhanced lateral resolution

PPP-LC-MFMR –  MFM tip with soft magnetic coating designed for the measurement of magnetic domains in soft magnetic samples

PPP-QLC-MFMR –  low coercivity MFM probe designed for high operation stability and low disturbance of magnetic samples under ultrahigh vacuum ( UHV ) conditions

SSS-MFMR – SuperSharp MFM probe for high resolution magnetic force imaging, low magnetic moment for reduced disturbance of soft magnetic samples

SSS-QMFMR – SuperSharp MFM probe for high resolution magnetic force imaging with a high mechanical Q-factor for applications in ultrahigh vacuum ( UHV ) .

The screencast introducing all these different MFM probes, their properties and their applications held by our Head of R&D Thomas Sulzbach has just passed the 1500 views mark. Congratulations Thomas!

NANOSENSORS AFM tips for Magnetic Force Microscopy

For further details please have a look at the NANOSENSORS MFM probes brochure.

Application examples for NANOSENSORS AFM probes for Magnetic Force Microscopy can be found in the NANOSENSORS blog.

NANOSENSORS screencasts on Magnetic Force Microscopy AFM probes are also available in

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On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion

Lately the production of nanocrystalline magnetic materials starting with coarse grained materials (top-down approach) has received increasing interest.*

The advantage of the top-down approach compared to the bottom-up approach ( e.g. using melt spinning, stacking of sheets, annealing treatments and other processing steps) is that rare-earth elements and additional processing steps such as stacking of sheets are not necessary.*

In the article “On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion” Martin Stückler, Christian Teichert, Aleksandar Matković, Heinz Krenn, Lukas Weissitsch, Stefan Wurster, Reinhard Pippan, Andrea Bachmaier present a preparation route of Co–Cu alloys with soft magnetic properties by high-pressure torsion deformation. Nanocrystalline, supersaturated single-phase microstructures are obtained after deformation of Co–Cu alloys, which are prepared from an initial powder mixture with Co-contents above 70 wt.%.*

The authors used NANOSENSORS SSS-MFMR magnetic AFM probes optimized for high resolution magnetic force imaging in the quantitative analysis of the magnetic microstructure by magnetic force microscopy to understand the measured magnetic properties and correlated this to the detected changes in coercivity.

The achieved results by Martin Stückler et al. show that the rising coercivity can be explained by a magnetic hardening effect occurring in context with spinodal decomposition.*

Fig. 6 from “On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion” by Martin Stückler et al.:
2 μm × 2 μm AFM scans of (a) as-deformed state and (c) 300 °C annealed state. The corresponding MFM scans of the as-deformed and 300 °C annealed state are shown in (b) and (d) respectively. The axial direction of the HPT specimen points out of the plane, the shear direction is in horizontal direction. The lateral scale bar in (a) applies to all scans. The minimum height and phase signal values are shifted to zero for visualization purposes.
NANOSENSORS SSS-MFMR magnetic AFM probes optimized for high resolution magnetic force microscopy were used
Fig. 6 from “On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion” by Martin Stückler et al.:
2 μm × 2 μm AFM scans of (a) as-deformed state and (c) 300 °C annealed state. The corresponding MFM scans of the as-deformed and 300 °C annealed state are shown in (b) and (d) respectively. The axial direction of the HPT specimen points out of the plane, the shear direction is in horizontal direction. The lateral scale bar in (a) applies to all scans. The minimum height and phase signal values are shifted to zero for visualization purposes.

*Martin Stückler, Christian Teichert, Aleksandar Matković, Heinz Krenn, Lukas Weissitsch, Stefan Wurster, Reinhard Pippan, Andrea Bachmaier
On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion
Journal of Science: Advanced Materials and Devices, Volume 6, Issue 1, March 2021, Pages 33-41
DOI: https://doi.org/10.1016/j.jsamd.2020.09.013

Please follow this external link to read the full article: https://www.sciencedirect.com/science/article/pii/S2468217920300873?via%3Dihub

Open Access The article “On the magnetic nanostructure of a Co–Cu alloy processed by high-pressure torsion” by Martin Stückler, Christian Teichert, Aleksandar Matković, Heinz Krenn, Lukas Weissitsch, Stefan Wurster, Reinhard Pippan, Andrea Bachmaier is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

Macroscopic manifestation of domain-wall magnetism and magnetoelectric effect in a Néel-type skyrmion host

In the article “Macroscopic manifestation of domain-wall magnetism and magnetoelectric effect in a Néel-type skyrmion host” Korbinian Geirhos, Boris Gross, Bertalan G. Szigeti, Andrea Mehlin, Simon Philipp, Jonathan S. White, Robert Cubitt, Sebastian Widmann, Somnath Ghara, Peter Lunkenheimer, Vladimir Tsurkan, Erik Neuber, Dmytro Ivaneyko, Peter Milde, Lukas M. Eng, Andrey O. Leonov, Sándor Bordács, Martino Poggio and István Kézsmárki report a magnetic state in GaV4Se8 which emerges exclusively in samples with mesoscale polar domains and not in polar mono-domain crystals.*

It is manifested by a sharp anomaly in the magnetic susceptibility and the magnetic torque, distinct from other anomalies observed also in polar mono-domain samples upon transitions between the cycloidal, the Néel-type skyrmion lattice and the ferromagnetic states. *

The authors ascribe this additional transition to the transformation of distinct magnetic textures, confined to polar domain walls (DW), to the ferromagnetic (FM) state. The emergence of these DW-confined magnetic states is likely driven by the mismatch of different spin spirals, hosted by the adjacent domains. A clear anomaly in the magneto-current indicates that the DW-confined magnetic states also have strong contributions to the magnetoelectric response. *

The authors expect polar DWs to commonly host such confined magnetic edge states and, thus, offer a fertile ground to explore novel forms of magnetism. *

To characterize the polar domains and to estimate the density of DWs in GaV4Se8, K. Geirhos et al. combined several complementary scanning probe microscopy techniques, including non-contact atomic force microscopy ( nc-AFM ), scanning dissipation microscopy ( SDM ), and frequency-modulated Kelvin-probe force microscopy ( KPFM ). *

In attempt to observe spin cycloidal and Néel-type skyrmion textures within polar domains of GaV4Se8, only evidenced by small-angle neutron scattering measurements so far43, the authors of the article also carried out magnetic force microscopy (MFM) measurements. A second purpose of the MFM study was to explore possible magnetic states confined to the vicinity of DWs, as reported in GaV4S8. *

NANOSENSORS™ SSS-QMFMR high resolution magnetic AFM probes for ultra high vacuum conditions were used for the magnetic measurements with scanning probe microscopy. *

NANOSENSORS™ conductive wear-resistant Platinum Silicide AFM probes of the PtSi-FM type were used for all other measurements described in the article. *

Supplementary Figure 1 a – d from “Macroscopic manifestation of domain-wall magnetism and magnetoelectric effect in a Néel-type skyrmion host” by K. Geirhos et al:

Typical ferroelectric do-main pattern observed on the (001) cleaved GaV4Se8 crystal surface  atT=10  K.
a, The topography is characterized by stripes roughly parallel to the [110] axis and folds parallel to the [010]  axis. The latter originate in the differently oriented distortion of the ferroelastic domains. The color scale corresponds to the z-displacement of the tip.
b ,In the dissipation channel of the nc-AFM every second domain appears bright. For the non-magnetic tip the dissipation originates from electric interactions. The dissipated power is indicated by the color scale. Please have a look at the full article to view the full supplementary figure.
NANOSENSORS Platinum Silicide PtSi-FM AFM probes were used for the imaging.
Supplementary Figure 1 a – d from “Macroscopic manifestation of domain-wall magnetism and magnetoelectric effect in a Néel-type skyrmion host” by K. Geirhos et al:

Typical ferroelectric do-main pattern observed on the (001) cleaved GaV4Se8 crystal surface  atT=10  K.
a, The topography is characterized by stripes roughly parallel to the [110] axis and folds parallel to the [010]  axis. The latter originate in the differently oriented distortion of the ferroelastic domains. The color scale corresponds to the z-displacement of the tip.
b ,In the dissipation channel of the nc-AFM every second domain appears bright. For the non-magnetic tip the dissipation originates from electric interactions. The dissipated power is indicated by the color scale. Please have a look at the full article to view the full supplementary figure.

*Korbinian Geirhos, Boris Gross, Bertalan G. Szigeti, Andrea Mehlin, Simon Philipp, Jonathan S. White, Robert Cubitt, Sebastian Widmann, Somnath Ghara, Peter Lunkenheimer, Vladimir Tsurkan, Erik Neuber, Dmytro Ivaneyko, Peter Milde, Lukas M. Eng, Andrey O. Leonov, Sándor Bordács, Martino Poggio and István Kézsmárki
Macroscopic manifestation of domain-wall magnetism and magnetoelectric effect in a Néel-type skyrmion host
npj Quantum Materials volume 5, Article number: 44 (2020)
DOI: https://doi.org/10.1038/s41535-020-0247-z

Please follow this external link to read the full article: https://rdcu.be/b7lgW

Open Access The article “Macroscopic manifestation of domain-wall magnetism and magnetoelectric effect in a Néel-type skyrmion host” by Korbinian Geirhos, Boris Gross, Bertalan G. Szigeti, Andrea Mehlin, Simon Philipp, Jonathan S. White, Robert Cubitt, Sebastian Widmann, Somnath Ghara, Peter Lunkenheimer, Vladimir Tsurkan, Erik Neuber, Dmytro Ivaneyko, Peter Milde, Lukas M. Eng, Andrey O. Leonov, Sándor Bordács, Martino Poggio and István Kézsmárki is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.