Self-sensing atomic force microscopy cantilevers based on tunnel magnetoresistance sensors

Tavassolizadeh, Ali; Meier, T.; Rott, Karsten; Reiss, Günter; Quandt, Eckhard; Hölscher, Hendrik; Meyners, Dirk

doi:10.1063/1.4801315

Cited by 17 publications

(12 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reading out the cantilever deflection by TMR sensors in the dynamic mode approves their reliability as an alternative for the optical read-out in AFM measurements. Figure 7c shows a topography image of a PMMA grating obtained by dynamic imaging using a TMR sensor read-out [6]. Having studied TMR sensors in terms of minimum detectable deflection as height and phase contrasts, atomic-step edges of 2.54 Å on Au (111) terraces and self-assembled monolayers of peruorodecyltrichlorosilane have been successfully imaged by amplitude and frequency modulated AFM [15].…”

Section: Resultsmentioning

confidence: 99%

“…The oscillating signal or

Δ R / R

is detected using a manually balanced Wheatstone bridge configuration, in which the TMR sensor is incorporated; ( c ) Dynamic imaging of a PMMA grating in amplitude modulation mode recorded by a TMR sensor. Panel ( c ) is reproduced from [6] with permission of AIP Publishing.…”

Section: Figurementioning

confidence: 99%

“…Profiting from high sensitivity [3], high band-width [4], and miniaturization possibilities, magnetostrictive magnetoresistance (MR) sensors are a promising alternative to piezoresistive and piezoelectric strain sensors. In particular, magnetostrictive TMR sensors with CoFeB/MgO/CoFeB structures [3,5,6] offer more scalability compared to magnetostrictive giant magnetoresistance sensors [7,8,9,10] and higher gauge factors compared to AlO x -based TMR sensors with amorphous CoFeB [11], crystalline Co 50 Fe 50 [12] and amorphous (Fe 90 Co 10 ) 78 Si 12 B 10 [13] electrodes. The CoFeB/MgO/CoFeB TMR sensors have been successfully incorporated into membranes for pressure sensing [5,14] and microcantilevers for atomic force microscopy (AFM) [6,15].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tunnel Magnetoresistance Sensors with Magnetostrictive Electrodes: Strain Sensors

Tavassolizadeh

Rott

Meier

et al. 2016

Sensors

Self Cite

View full text Add to dashboard Cite

Magnetostrictive tunnel magnetoresistance (TMR) sensors pose a bright perspective in micro- and nano-scale strain sensing technology. The behavior of TMR sensors under mechanical stress as well as their sensitivity to the applied stress depends on the magnetization configuration of magnetic tunnel junctions (MTJ)s with respect to the stress axis. Here, we propose a configuration resulting in an inverse effect on the tunnel resistance by tensile and compressive stresses. Numerical simulations, based on a modified Stoner–Wohlfarth (SW) model, are performed in order to understand the magnetization reversal of the sense layer and to find out the optimum bias magnetic field required for high strain sensitivity. At a bias field of −3.2 kA/m under a 0.2×10-3 strain, gauge factors of 2294 and −311 are calculated under tensile and compressive stresses, respectively. Modeling results are investigated experimentally on a round junction with a diameter of 30±0.2sans-serifμm using a four-point bending apparatus. The measured field and strain loops exhibit nearly the same trends as the calculated ones. Also, the gauge factors are in the same range. The junction exhibits gauge factors of 2150±30 and −260 for tensile and compressive stresses, respectively, under a −3.2 kA/m bias magnetic field. The agreement of the experimental and modeling results approves the proposed configuration for high sensitivity and ability to detect both tensile and compressive stresses by a single TMR sensor.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The oscillating signal or

Δ R / R

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tunnel Magnetoresistance Sensors with Magnetostrictive Electrodes: Strain Sensors

Tavassolizadeh

Rott

Meier

et al. 2016

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…In an atomic force microscope, for instance, the tip position can be monitored in real-time using methods like laser beam deflection [43–44], laser interferometry [45–46] or self-sensing [47–49]. For cold-atomic ensembles, the standard detection method is absorption imaging [50].…”

Section: Detecting Tip Dynamicsmentioning

confidence: 99%

Dynamic of cold-atom tips in anharmonic potentials

Menold

Federsel

Rogulj

et al. 2016

Beilstein J. Nanotechnol.

Self Cite

View full text Add to dashboard Cite

Background: Understanding the dynamics of ultracold quantum gases in an anharmonic potential is essential for applications in the new field of cold-atom scanning probe microscopy. Therein, cold atomic ensembles are used as sensitive probe tips to investigate nanostructured surfaces and surface-near potentials, which typically cause anharmonic tip motion. Results: Besides a theoretical description of this anharmonic tip motion, we introduce a novel method for detecting the cold-atom tip dynamics in situ and real time. In agreement with theory, the first measurements show that particle interactions and anharmonic motion have a significant impact on the tip dynamics. Conclusion: Our findings will be crucial for the realization of high-sensitivity force spectroscopy with cold-atom tips and could possibly allow for the development of advanced spectroscopic techniques such as Q-control.

show abstract

“…In an atomic force microscope, for instance, the tip position can be monitored in real-time using methods like laser beam deflection [43,44], laser interferometry [ 45,46] or self-sensing [ 47,48,49]. For cold-atomic ensembles, the standard detection method is absorption imaging [50].…”

Section: Detecting Tip Dynamicsmentioning

confidence: 99%