Tag Archives: torsion magnetometry

Two New MSS Sensors for Torque Magnetometry added to Special Developments List

NANOSENSORS™ has completed the development of two additional Membrane-type Surface-stress Sensors (MSS) ( SD-MSS-1KPMAl and SD-MSS-1KPMAu ) dedicated for torque magnetometry.

Torque magnetometry is a useful technique often employed for assessment of various materials like organic conductors, magnetic and superconductor materials.

Now NANOSENSORS™ has added two new types of MSS for this application “SD-MSS-1KPMAl” and “SD-MSS-1KPMAu” to the NANOSENSORS™Special Developments List.

These sensors can be used for nanomechanical sensing, material assessment, static/pulsed-field torque magnetometry, force sensing, and other applications.

The new sensor chips share the common MSS features, i.e., a membrane (or platform) supported with four beams on which piezoresistors are embedded at the fixed ends.

In the newly developed sensor chips however, the sensing beams are longer than in MSS chips meant for odour sensing applications (SD-MSS-1K2G) and form “bending” and “torsional” axes.

There are now three types of Membrane-type Surface-stress Sensor (MSS) dedicated for torque magnetometry available.

All three have in common that for two different functional axes, differently designed piezoresistors are embedded to effectively sense the torque generated by the sample. Considering a use at cryogenic temperatures, the resistance of the piezoresistor is designed relatively low and in the range of 0.3 – 1.2 kΩ. Each piezoresistor can be individually connected so that various measurement configurations can be arranged by the user.

Compared to the conventionally used piezoresistive cantilevers, the new types of Membrane-type Surface-stress Sensor “SD-MSS-1KTM, SD-MSS-1KPMAl and SD-MSS-1KPMAu ) have many advantages:

  • easier to handle the chip
  • relatively robust structure
  • larger sample capability, etc.,

all of which facilitate preparations of measurement setup and increase turnaround of material assessment.

The chip dimension of the newly added SD-MSS-1KPMAl and SD-MSS-1KPMAu are 3.0 x 2.0 x 0.3 mm.

Compared to SD-MSS-1KTM two piezoresistive cantilevers and a coil are additionally integrated in SD-MSS-1KPMAl and SD-MSS-1KPMAu.

The SD-MSS-1KPMAl’s electric configuration features Aluminum pads for wire bonding or gluing.

NANOSENSORS Membrane-type Surface-stress Sensor MSS for torque magnetometry SD-MSS-1KPMAl . Newly added to the NANOSENSORS Special Developments List.
NANOSENSORS Membrane-type Surface-stress Sensor MSS for torque magnetometry SD-MSS-1KPMAl ( with Aluminum pads )

The SD-MSS-1KPMAu’s electric configuration features Gold pads for wire bonding or gluing.

NANOSENSORS Membrane-type Surface-stress Sensor MSS for torque magnetometry SD-MSS-1KPMAu . Newly added to the NANOSENSORS Special Developments List
NANOSENSORS Membrane-type Surface-stress Sensor MSS for torque magnetometry SD-MSS-1KPMAu ( with gold pads )

For further technical information, price or delivery times please contact us at info(at)nanosensors.com

Resonant torsion magnetometry in anisotropic quantum materials

Who said that AFM probes can only be used for Atomic Force Microscopy?

In the article “Resonant torsion magnetometry in anisotropic quantum materials” which just appeared in Nature Communications, K. A. Modic, Maja D. Bachmann, B. J. Ramshaw, F. Arnold, K. R. Shirer, Amelia Estry, J. B. Betts, Nirmal J. Ghimire, E. D. Bauer, Marcus Schmidt, Michael Baenitz, E. Svanidze, Ross D. McDonald, Arkady Shekhter and Philip J. W. Moll use the NANOSENSORS™ Akiyama-probe for resonant torsion magnetometry.

Figure 1 from "Resonant torsion magnetometry in anisotropic quantum materials": Schematic overview of resonant torsion magnetometry. a First and second derivatives of the free energy with respect to the magnetic field B and the field orientation θ. b The quartz tuning fork of the Akiyama A-probe (http://www.akiyamaprobe.com) is electrically excited at the lowest-resonance mode of the silicon cantilever, producing a large out-of-plane motion at the tip of the cantilever. c Schematic representing the principle of measuring the magnetotropic coefficient k. In a magnetic field, the magnetic torque brings the lever to a new equilibrium position. The magnetic energy of the samples changes the effective stiffness of the lever, leading to a shift in the resonant frequency. d The silicon cantilever glued to each leg of the quartz tuning fork with a single crystal of RuCl3 mounted at the tip with Bayer silicone grease
Figure 1 from “Resonant torsion magnetometry in anisotropic quantum materials”: Schematic overview of resonant torsion magnetometry a First and second derivatives of the free energy with respect to the magnetic field B and the field orientation θ. b The quartz tuning fork of the Akiyama A-probe (http://www.akiyamaprobe.com) is electrically excited at the lowest-resonance mode of the silicon cantilever, producing a large out-of-plane motion at the tip of the cantilever. c Schematic representing the principle of measuring the magnetotropic coefficient k. In a magnetic field, the magnetic torque brings the lever to a new equilibrium position. The magnetic energy of the samples changes the effective stiffness of the lever, leading to a shift in the resonant frequency. d The silicon cantilever glued to each leg of the quartz tuning fork with a single crystal of RuCl3 mounted at the tip with Bayer silicone grease

There are three advantages why it makes sense to divert the NANOSENSORS™ Akiyama-probe from it’s orginal intended use and use it for resonant torque magnetometry instead:

1. the relatively large spring constant of the silicon cantilever allows the authors to extend ultrasensitive and dynamic cantilever magnetometry to macroscopic sample sizes

  1. “the placement of the sample on the silicon cantilever (rather than one leg of a quartz tuning fork) eliminates complications that arise from the center of mass motion of the tuning fork coupling to the resonance mode

3. the electrical read-out of the A-probe eliminates the need for optical detection of the resonant frequency, thus making setup relatively straightforward and more robust compared to previous approaches.”*

*K. A. Modic, Maja D. Bachmann, B. J. Ramshaw, F. Arnold, K. R. Shirer, Amelia Estry, J. B. Betts, Nirmal J. Ghimire, E. D. Bauer, Marcus Schmidt, Michael Baenitz, E. Svanidze, Ross D. McDonald, Arkady Shekhter; Philip J. W. Moll
Resonant torsion magnetometry in anisotropic quantum materials
Nature Communications, volume 9, Article number: 3975 (2018)
DOI: https://doi.org/10.1038/s41467-018-06412-w

For the full article please follow this external link: https://rdcu.be/7Z0A

Open Access The article “Resonant torsion magnetometry in anisotropic quantum materials” by K.A. Modic 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/.