Signal enhancement in cantilever magnetometry based on a co-resonantly coupled sensor

Reiche

Büchner

et al. 2016

J. Sens. Sens. Syst.

Self Cite

Abstract. Understanding the behaviour of mechanical systems can be facilitated and improved by employing electro-mechanical analogies. These analogies enable the use of network analysis tools as well as purely analytical treatment of the mechanical system translated into an electric circuit. Recently, we developed a novel kind of sensor set-up based on two coupled cantilever beams with matched resonance frequencies (co-resonant coupling) and possible applications in magnetic force microscopy and cantilever magnetometry. In order to analyse the sensor's behaviour in detail, we describe it as an electric circuit model. Starting from a simplified coupled harmonic oscillator model with neglected damping, we gradually increase the complexity of the system by adding damping and interaction elements. For each stage, various features of the coupled system are discussed and compared to measured data obtained with a co-resonant sensor. Furthermore, we show that the circuit model can be used to derive sensor parameters which are essential for the evaluation of measured data. Finally, the much more complex circuit representation of a bending beam is discussed, revealing that the simplified circuit model of a coupled harmonic oscillator is a very good representation of the sensor system.

Section: J Körner Et Al: Electric Network Description Of a Co-resonmentioning

confidence: 96%

Section: J Körner Et Al: Electric Network Description Of a Co-resonmentioning

confidence: 99%

Section: Experimental Verification Of the Circuit Modelmentioning

confidence: 99%

Section: Experimental Verification Of the Circuit Modelmentioning

confidence: 99%

See 2 more Smart Citations

Employing electro-mechanical analogies for co-resonantly coupled cantilever sensors

Reiche

Büchner

et al. 2016

J. Sens. Sens. Syst.

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“…Co-resonant cantilever sensors have been shown to tremendously increase the signal strength in proof-of-principle experiments in cantilever magnetometry and magnetic force microscopy (MFM) [1][2][3]. Since the measurement principle is only based on the coupling and eigenfrequency matching (termed as co-resonance) of a micro-and a nanocantilever, it could potentially by extended to other applications for dynamic-mode cantilever sensors, for example gas sensing ('artificial nose') [4] or mass sensors [5].…”

Section: Introductionmentioning

confidence: 99%

Effective Sensor Properties of a Novel Co-Resonant Cantilever Sensor

2019

Eurosensors 2018

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Co-resonantly coupled cantilever sensors have recently been introduced as a very promising concept to strongly increase the sensitivity of dynamic-mode cantilever MEMS sensors (several orders of magnitude experimentally demonstrated) while maintaining the ease of detection. Mechanical coupling and eigenfrequency matching of a micro- and a nanocantilever lead to a coupled system where any interaction at the highly sensitive nanocantilever alters the oscillatory state of the entire system which is detected at the microcantilever with standard laser-based methods. The coupled system’s sensor properties are described by effective parameters which depend on the subsystems’ properties and the degree of eigenfrequency matching. Here, the focus is on the implications of the effective properties on sensor performance with regard to sensitivity and detectability, which will be illustrated by an exemplary sensor model.

Magnetic properties of individual Co2FeGa Heusler nanoparticles studied at room temperature by a highly sensitive co-resonant cantilever sensor

Reiche

Ghunaim

et al. 2017

Sci Rep

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The investigation of properties of nanoparticles is an important task to pave the way for progress and new applications in many fields of research like biotechnology, medicine and magnetic storage techniques. The study of nanoparticles with ever decreasing size is a challenge for commonly employed methods and techniques. It requires increasingly complex measurement setups, often low temperatures and a size reduction of the respective sensors to achieve the necessary sensitivity and resolution. Here, we present results on how magnetic properties of individual nanoparticles can be measured at room temperature and with a conventional scanning force microscopy setup combined with a co-resonant cantilever magnetometry approach. We investigate individual Co2FeGa Heusler nanoparticles with diameters of the order of 35 nm encapsulated in carbon nanotubes. We observed, for the first time, magnetic switching of these nanoparticles in an external magnetic field by simple laser deflection detection. Furthermore, we were able to deduce magnetic properties of these nanoparticles which are in good agreement with previous results obtained with large nanoparticle ensembles in other experiments. In order to do this, we expand the analytical description of the frequency shift signal in cantilever magnetometry to a more general formulation, taking unaligned sensor oscillation directions with respect to the magnetic field into account.