Test of non-Newtonian gravitational forces at micrometer range with two-dimensional force mapping

Wang, Jianbo; Guan, Shengguo; Chen, Kai; Wu, Wenjie; Tian, Zhaoyang; Luo, Pengshun; Jin, Aizi; Yang, Shan-Qing; Shao, Cheng-Gang; Luo, Jun

doi:10.1103/physrevd.94.122005

Cited by 20 publications

(12 citation statements)

References 42 publications

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“…The pattern is similar to what we observed in Ref. [40], which is mainly due to the patch electrostatic effect. Fortunately, for the type of the interaction we are looking for, the signal appears only in the imaginary part, according to Eq.…”

supporting

confidence: 91%

“…The experiment was performed on a home-built scanning probe microscope as described in Ref. [40]. Data were collected using a silicon cantilever with a dimension of 430 μm × 46 μm × 540 nm.…”

mentioning

confidence: 99%

“…The effective spring constant of the cantilever is determined to be 3.3ð3Þ mN=m using the method presented in Ref. [40]; its resonance frequency is measured to be 426 Hz with a quality factor of 6134. The noise floor of the force sensor is ∼13 fN= ffiffiffiffiffi ffi Hz p at 6f d as derived from the noise floor of the cantilever displacement measurement (Fig.…”

mentioning

confidence: 99%

“…To set constraints on the coupling strength of the exotic interaction, we analyze the data with maximum likelihood estimation [40]. The probability density of observing the 2D map is calculated as a function of the position offset x 00 and the coupling strength f ⊥ for every λ according to…”

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confidence: 99%

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Constraints on the Velocity and Spin Dependent Exotic Interaction at the Micrometer Range

et al. 2020

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Constraints on the Velocity and Spin Dependent Exotic Interaction at the Micrometer Range

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“…Axion-Like Particles: Cannex Test of the Quantum Vacuum G. L. Klimchitskaya, V. M. Mostepanenko, R. I. P. Sedmik, and H. Abele performed by means of a micromechanical torsional oscillator. The green line shows the constraints obtained from measuring the difference in lateral forces [48]. The constraints indicated by the black line are found in [49] from the torsion pendulum experiment.…”

Section: Prospects For Searching Thermal Effects Non-newtonian Gravimentioning

confidence: 99%

Prospects for Searching Thermal Effects, Non-Newtonian Gravity and Axion-Like Particles: Cannex Test of the Quantum Vacuum

2019

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PreprintVersionWe consider the Cannex (Casimir And Non-Newtonian force EXperiment) test of the quantum vacuum intended for measuring the gradient of the Casimir pressure between two flat parallel plates at large separations and constraining parameters of the chameleon model of dark energy in cosmology. A modification of the measurement scheme is proposed that allows simultaneous measurements of both the Casimir pressure and its gradient in one experiment. It is shown that with several improvements the Cannex test will be capable to strengthen the constraints on the parameters of the Yukawa-type interaction by up to an order of magnitude over a wide interaction range. The constraints on the coupling constants between nucleons and axion-like particles, which are considered as the most probable constituents of dark matter, could also be strengthened over a region of axion masses from 1 to 100 meV.collaboration. On the background of Casimir forces, one could also search for axions and other axion-like particles [13][14][15][16][17][18][19][20] which are considered as hypothetical constituents of dark matter. It is remarkable that taken together, dark energy and dark matter contribute for more than 95% of the energy of the Universe, leaving less than 5% to the forms of energy we are presently capable to observe directly [6].Precise measurements of the Casimir force revealed a problem that the experimental data agree with theoretical predictions of the fundamental Lifshitz theory only under the condition that in calculations one disregards the relaxation properties of conduction electrons and the conductivity at a constant current for metallic and dielectric boundary surfaces, respectively (see review in [5,21] and more modern experiments [22][23][24][25][26][27]). Theoretically, it was shown that an inclusion of the relaxation properties of conduction electrons and the conductivity at a constant current in computations results in a violation of the Nernst heat theorem for the Casimir entropy (see review in [5,21] and further results [28][29][30][31]). Taking into account that both the relaxation properties of conduction electrons for metals and the conductivity at a constant current for dielectrics are well studied really existing phenomena, there must be profound physical reasons for disregarding them in calculations of the Casimir force caused by the zero-point and thermal fluctuations of the electromagnetic field.All precise experiments on measuring the Casimir interaction mentioned above have been performed in the sphere-plate geometry at surface separations below a micrometer. In this paper, we consider the Cannex (Casimir And Non-Newtonian force EXperiment) that was designed to test the quantum vacuum in the configuration of two parallel plates at separations up to 15 µm [32,33]. In addition to the already discussed possibility of testing the nature of dark energy [32], we consider here the potentialities of this experiment for searching thermal effects in the Casimir force, stronger constraints on Yukawa-type c...

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Quantitative magnetization measurements of magnetic particles with FePt standard samples

Luo,

Wang,

et al. 2023

Journal of Applied Physics

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Micrometer-sized magnetic particles have been widely used in magnetic force microscopy, magnetic resonance force microscopy, and bio-sensing. To quantitatively interpret the data obtained with magnetic particles, it is important to know the magnetic properties of the particles. However, the magnetic moment of individual particle is usually too small to be measured by common instruments for samples with large volume. Here, we present a method to characterize magnetic microspheres using patterned FePt thin films as standard samples. The FePt thin film in the L10 phase has perpendicular magnetic anisotropy, and the patterned features can be magnetized to near single-domain magnets, which make them suitable standards for magnetic sphere calibration with magnetic force microscopy. Multiple linear regression is used to analyze the frequency shift images and obtain the effective dipole moment of the spheres. The position of the dipole moment is obtained by minimizing the residuals in multiple linear regression with a gradient descent algorithm. Three NdFeB spheres of different diameters were measured. It was found that the magnetization increases with the increase in the diameter of the sphere, possibly due to the weakening of ferromagnetism on the surface.

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Test of non-Newtonian gravitational forces at micrometer range with two-dimensional force mapping

Cited by 20 publications

References 42 publications

Constraints on the Velocity and Spin Dependent Exotic Interaction at the Micrometer Range

Constraints on the Velocity and Spin Dependent Exotic Interaction at the Micrometer Range

Prospects for Searching Thermal Effects, Non-Newtonian Gravity and Axion-Like Particles: Cannex Test of the Quantum Vacuum

Quantitative magnetization measurements of magnetic particles with FePt standard samples

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