Category: News

Magnetization-polarization cross-control near room temperature in hexaferrite single crystals

In their publication “Magnetization-polarization cross-control near room temperature in hexaferrite single crystals” V. Kocsis, T. Nakajima, M. Matsuda, A. Kikkawa, Y. Kaneko, J. Takashima, K. Kakurai, T. Arima, F. Kagawa, Y. Tokunaga, Y. Tokura and Y. Taguchi report that they have successfully stabilized a simultaneously ferrimagnetic and ferroelectric phase in a Y-type hexaferrite single crystal up to 450 K, and demonstrated the reversal of large non-volatile M by E field close to room temperature. Manipulation of the magnetic domains by E field was directly visualized at room temperature by using magnetic force microscopy.*

NanoWorld MFMR AFM probes with a hard magnetic coating were used for the magnetic force microscopy measurements described in this article.

Figure 5 from “Magnetization-polarization cross-control near room temperature in hexaferrite single crystals” by V. Kocsis et al.: Real-space magnetic force microscopy (MFM) images. The MFM images were taken on the same 10 × 10 μm2 region of a BSCFAO crystal with an ac face (see Supplementary Figs. 3, 9 and 10) at room temperature. Prior to the MFM measurements, the sample was poled to a single-domain ME state using (+E0, +H0) poling fields in a E ⊥ H; E, H ⊥ c configuration. Panel a shows the changes in the magnetic domain pattern caused by two successive applications of the E field with different signs (the initial state is labeled as the 0th). The images include small regions, R1 and R2, where two representative cases of DW motion are observed. Around R1, the negatively magnetized domain (denoted with blue color, MFM phase shift Δφ < 0) expands and shrinks along the c-axis upon the first and second applications of E-field, respectively. On the other hand, around R2, a positively magnetized domain (denoted with red color, Δφ > 0) is pushed into the view area from the upper side along the ab plane. These two cases are further displayed as line profiles of the MFM phase shift (Δφ) data along the b A−A′ and c B−B′ lines. Panels d, e show the schematic illustration of these two cases of domain wall motions for the second E-field switch, respectively. NanoWorld MFMR AFM probes were used for the magnetic force microscopy.
Figure 5 from “Magnetization-polarization cross-control near room temperature in hexaferrite single crystals” by V. Kocsis et al.: Real-space magnetic force microscopy (MFM) images. The MFM images were taken on the same 10 × 10 μm2 region of a BSCFAO crystal with an ac face (see Supplementary Figs. 3, 9 and 10) at room temperature. Prior to the MFM measurements, the sample was poled to a single-domain ME state using (+E0, +H0) poling fields in a E ⊥ H; E, H ⊥ c configuration. Panel a shows the changes in the magnetic domain pattern caused by two successive applications of the E field with different signs (the initial state is labeled as the 0th). The images include small regions, R1 and R2, where two representative cases of DW motion are observed. Around R1, the negatively magnetized domain (denoted with blue color, MFM phase shift Δφ < 0) expands and shrinks along the c-axis upon the first and second applications of E-field, respectively. On the other hand, around R2, a positively magnetized domain (denoted with red color, Δφ > 0) is pushed into the view area from the upper side along the ab plane. These two cases are further displayed as line profiles of the MFM phase shift (Δφ) data along the b A−A′ and c B−B′ lines. Panels d, e show the schematic illustration of these two cases of domain wall motions for the second E-field switch, respectively.

*V. Kocsis, T. Nakajima, M. Matsuda, A. Kikkawa, Y. Kaneko, J. Takashima, K. Kakurai, T. Arima, F. Kagawa, Y. Tokunaga, Y. Tokura, Y. Taguchi
Magnetization-polarization cross-control near room temperature in hexaferrite single crystals
Nature Communications, volume 10, Article number: 1247 (2019)
DOI: https://doi.org/10.1038/s41467-019-09205-x

Please follow this external link to the full article: https://www.nature.com/articles/s41467-019-09205-x

Open Access The article ” Magnetization-polarization cross-control near room temperature in hexaferrite single crystals” by V. Kocsis et al. 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/.

NanoWorld™ appoints NanoAndMore Japan as a distributor for Japan

In a further move to extend its worldwide network of distribution partners NanoWorld™ today has appointed the recently founded NanoAndMore Japan KK (NanoAndMore ジャパン ) as a distributor of its line of probes for Atomic Force Microscopy (AFM) and Scanning Probe Microscopy (SPM) in Japan.

NanoAndMore Japan will keep a large stock of NanoWorld AFM probes on site enabling a fast delivery and will sell NanoWorld AFM probes at manufacturer recommended prices.

NanoWorld™ is convinced that this addition to the already existing distribution network will work for the benefit of its customers.

NanoAndMore ジャパン CEO Mr. Nobuhiro Saito has many years of AFM expertise and is looking forward to assisting customers with the selection of the right AFM probes for their various application needs.

Please refer to the contact data below or to our list of distributors on the “how to buy” page on the NanoWorld webpage.

NanoAndMore ジャパン
201 KTT5 Building, 1-1-1 Waseda, Misato-shi
Saitama-ken 341-0018
Japan

Phone: +81 (48) 951-0958

Contact: Mr. Nobuhiro Saito
info@nanoandmore.jp
www.nanoandmore.jp

NanoWorld Ultra-Short-Cantilevers (USC) - AFM tips for video rate atomic force microscopy
NanoWorld Ultra-Short Cantilevers (USC) for High-Speed AFM (HS-AFM)

Adhesion strategies of Dictyostelium discoideum – a force spectroscopy study

“Motile cells require reversible adhesion to solid surfaces to accomplish force transmission upon locomotion. In contrast to mammalian cells, Dictyostelium discoideum ( a soil dwelling amoeba) cells do not express integrins forming focal adhesions but are believed to rely on more generic interaction forces that guarantee a larger flexibility; even the ability to swim has been described for Dictyostelium discoideum (D.d.).”*

In order to understand the origin of D.d. adhesion, Nadine Kamprad, Hannes Witt, Marcel Schröder, Christian Titus Kreis, Oliver Bäumchen, Andreas Janshoff and Marco Tarantola  describe in their publication “Adhesion strategies of Dictyostelium discoideum – a force spectroscopy study”* how they realized and modified a variety of conditions for the amoeba comprising the absence and presence of the specific adhesion protein Substrate Adhesion A (sadA), glycolytic degradation, ionic strength, surface hydrophobicity and strength of van der Waals interactions by generating tailored model substrates. By employing AFM-based single cell force spectroscopy (using NanoWorld Arrow-TL2 tipless cantilevers) they could show that experimental force curves upon retraction exhibit two regimes described in detail in the article cited above. The study describes a versatile mechanism that allows the cells to adhere to a large variety of natural surfaces under various conditions.

Fig. 2 A from "Adhesion strategies of Dictyostelium discoideum – a force spectroscopy study": Cell parametrization: β, angle between the normal on the cell membrane and the cell axis; R1, contact radius between the cell and substrate; R0, equatorial cell radius; R2, contact radius between the cell and cantilever, ϕ1 contact angle towards the substrate; ϕ2, contact angle between the cell and cantilever, in the background is a section of the confocal image in B. B: morphology of the carA-1-GFP labelled D.d. cell attached to the cantilever subjected to a pulling force of 0.2 nN. NanoWorld Arrow-TL2 tipless cantilevers were used.
Fig. 2 A from “Adhesion strategies of Dictyostelium discoideum – a force spectroscopy study” by N. Kamprad et al.: Cell parametrization: β, angle between the normal on the cell membrane and the cell axis; R1, contact radius between the cell and substrate; R0, equatorial cell radius; R2, contact radius between the cell and cantilever, ϕ1 contact angle towards the substrate; ϕ2, contact angle between the cell and cantilever, in the background is a section of the confocal image in B. B: morphology of the carA-1-GFP labelled D.d. cell attached to the cantilever subjected to a pulling force of 0.2 nN.

*Nadine Kamprad, Hannes Witt, Marcel Schröder, Christian Titus Kreis, Oliver Bäumchen, Andreas Janshoff, Marco Tarantola
Adhesion strategies of Dictyostelium discoideum – a force spectroscopy study
Nanoscale, 2018, 10, 22504-22519
DOI: 10.1039/C8NR07107A

To read the full article follow this external link: https://pubs.rsc.org/en/content/articlehtml/2018/nr/c8nr07107a

Open Access The article “Adhesion strategies of Dictyostelium discoideum – a force spectroscopy study” by Nadine Kamprad, Hannes Witt, Marcel Schröder, Christian Titus Kreis, Oliver Bäumchen, Andreas Janshoff and Marco Tarantola is licensed under a Creative Commons Attribution 3.0 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/3.0/.