Structural and Magnetic Properties of FePt–C Nanocomposite Films

Wang, Hao; Yang, Fuqiang; Chen, Kansong; Zhou, Bin; Yuanwei, Zhang; Haoshuang, Gu

doi:10.1088/0256-307x/21/5/052

Cited by 10 publications

(11 citation statements)

References 16 publications

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“…Xu et al [5] verified that, besides relative humidity, the pull-off force depends on the contact time. Such effects were measured by Sedin and Rowlen [6] and the present authors [7]. Tang et al [8] studied the effect of relative humidity on the adhesion forces of several inorganic crystals by AFM.…”

Section: Introductionsupporting

confidence: 58%

“…Here, we take the nitrogen atmosphere as very low relative humidity. The authors [7] measured the adhesion force as a function of the contact time indirectly for different samples, with the contact time being controlled by adjusting the frequency of the vertical motion of the AFM tip. With relative humidity being limited to 25%, decreasing or unchanging adhesion force was not found in that study.…”

Section: Resultsmentioning

confidence: 99%

“…Its time dependence suggests that the variation of the adhesion force originates from the formation of liquid bridges between the AFM and the substrate. In [7], a simple mechanism of liquid bridge formation was presented, but the flow of the liquid thin film was not discussed. Some authors [10,11] investigated the behaviour of liquid lubricant film through disjoining and capillary pressure.…”

Section: Discussionmentioning

confidence: 99%

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Growth of liquid bridge in AFM

Wang

Zhao

2007

J. Phys. D: Appl. Phys.

139

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Capillary forces are dominant in adhesive forces measured with an atomic force microscope (AFM) in ambient air, which are thought to be dependent on water film thickness, relative humidity and the free energy of the water film. In this paper, besides these factors, we study the nature of the ‘pull-off’ force on a variety of atmospheres as a function of the contact time. It is found that capillary forces strongly depend on the contact time. In lower relative humidity atmosphere, the adhesion force is almost independent of the contact time. However, in higher relative humidity, the adhesion force increases with the contact time. Based on the experiment and a model that we present in this paper, the growth of the liquid bridge can be seen as undergoing two processes: one is water vapour condensation; the other is the motion of the thin liquid film that is absorbed on the substrate. The experiment and the growth model presented in this paper have direct relevance to the working mechanism of AFM in ambient air.

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Section: Introductionsupporting

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Growth of liquid bridge in AFM

Wang

Zhao

2007

J. Phys. D: Appl. Phys.

139

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“…These technologies can be divided into cooperative visual perception and noncooperative visual perception according to the characteristics of visual targets. [91][92][93] Cooperative visual perception technologies are currently relatively mature and have been successfully used in many space robots. Some cooperative visual markers are shown in Figure 10.…”

Section: Visual Perception For Noncooperative Targetsmentioning

confidence: 99%

Advances in Space Robots for On‐Orbit Servicing: A Comprehensive Review

Jiang

Liu

et al. 2023

Advanced Intelligent Systems

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Space robots play a significant role in on‐orbit servicing (OOS) missions, such as inspecting, capturing, refueling, and repairing satellites, assembling and maintaining large space infrastructure, and removing orbital debris. Over the past four decades, many space robot engineering applications and technology verifications for OOS have been accomplished. This article comprehensively reviews the advances by representative space robotic programs on space shuttles, outside/inside the International Space Station and the China Space Station, as well as on satellites, and the development trends of space robots are summarized. In addition, the primary key technologies and challenges are explored, including the following: 1) visual perception for noncooperative targets; 2) motion planning and control with a free‐floating base and flexibility; 3) multifunctional end‐effectors; 4) ground teleoperation with long time delays; and 5) high‐fidelity ground verification. Finally, the prospects for space robot future research are presented.

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“…This occurs if an electric field is applied perpendicular to the

(001)

surface or for asymmetric QWs. [ 11–15 ] In the latter case, an asymmetry may appear in DQWs with barriers of different heights, [ 13–15 ] with different chemical composition [ 16 ] or by triangular barriers [ 11 ] for instance.…”

Section: Theorymentioning

confidence: 99%

Photoluminescence of Double Quantum Wells: Asymmetry and Excitation Laser Wavelength Effects

Bravo-Velazquez

Lastras-Martı́nez

Ruiz-Cigarrillo

et al. 2022

Physica Status Solidi (b)

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Circularly polarized photoluminescence (PL) spectroscopy measured at 19 K on GaAs/AlGaAs symmetric and asymmetric double quantum wells (DQW) is reported. The PL is obtained by exciting the sample with a circularly polarized (left or right) laser in order to create an initial unbalanced distribution of electron spins in the conduction band and, in this way, obtain the electron spin lifetime . The effects of the excitation laser wavelength are estimated by exciting with laser wavelengths of 701.0, 787.0, 801.5, and 806.5 nm. The increase of with the excitation wavelength is attributed to the lower initial quasimomentum k of the excited carriers, which also reduces spin–orbit relaxation processes. is found to be higher in asymmetric DQWs: this is attributed to the wider QWs in these samples, which reduces spin relaxation due to the Dresselhaus mechanism. In addition, a smaller contribution from the Rashba mechanism is also detected by comparing samples with built‐in electric fields of different orientations defined by doped barrier layers.

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Structural and Magnetic Properties of FePt–C Nanocomposite Films

Cited by 10 publications

References 16 publications

Growth of liquid bridge in AFM

Growth of liquid bridge in AFM

Advances in Space Robots for On‐Orbit Servicing: A Comprehensive Review

Photoluminescence of Double Quantum Wells: Asymmetry and Excitation Laser Wavelength Effects

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