232 results about "Magnetic force microscope" patented technology

The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein the coercive force measured in the longitudinal direction of the magnetic tape is less than or equal to 167 kA/m, a timing-based servo pattern is present on the magnetic layer, and the edge shape specified by observing the timing-based servo pattern with a magnetic force microscope is a shape in which the difference between the value of the 99.9% cumulative distribution function of the width of misalignment from the ideal shape in the longitudinal direction of the magnetic tape and the value L_0.1 of the 0.1% cumulative distribution function, L_99.9-L_0.1, is less than or equal to 180 nm.

The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm³, an XRD intensity ratio Int(110)/Int(114) obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and an edge shape of the timing-based servo pattern specified by magnetic force microscope observation is a shape in which a difference (L_99.9−L_0.1) is equal to or smaller than 180 nm, and a magnetic tape device including the magnetic tape.

The magnetic recording medium comprises a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. In the magnetic recording medium, a number of protrusions equal to or greater than 10 nm in height on the magnetic layer surface, as measured by an atomic force microscope, ranges from 50 to 500/1,600 μm², the binder comprises a polyurethane resin with a weight average molecular weight ranging from 100,000 to 200,000, and the magnetic layer further comprises a carbonic ester having a molecular weight ranging from 360 to 460.

The magnetic tape device includes a magnetic tape; and a reproducing head, in which the reproducing head is a TMR head, a center line average surface roughness Ra measured regarding a surface of the magnetic layer of the magnetic tape is equal to or smaller than 2.0 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and a ratio (Sdc/Sac) of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster of the magnetic tape in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.

The invention relates to scanning magnetic microscope which has a photoluminescent nanoprobe implanted in the tip apex of an atomic force microscope (AFM), a scanning tunneling microscope (STM) or a near-field scanning optical microscope (NSOM) and exhibits optically detected magnetic resonance (ODMR) in the vicinity of unpaired electron spins or nuclear magnetic moments in the sample material. The described spin microscope has demonstrated nanoscale lateral resolution and single spin sensitivity for the AFM and STM embodiments.

The invention relates to a probe of a conducting atomic force microscope. The probe comprises: a substrate of a cantilever probe; a needle tip; and a conductive film, which is arranged at a surface of the needle tip. Besides, the material of the conductive film is graphene. Moreover, the invention provides a method that employs the probe to measure local conductivity of a semiconductor and a needle tip-free near-field optical detection method that employs the probe to measure a terahertz wave band. According to the invention, graphene is utilized, wherein the grapheme has the following characteristics that: the graphene is composed of carbon atoms and is thin to a monatomic layer; and the graphene is a semimetal two-dimensional thin material that has a zero gap; besides, the probe has advantages of good conductivity and high electron mobility; moreover, a Fermi surface can carry out self-adjustment with charging and discharging motions and a carrier injection potential is low. In addition, an electronic plasmon oscillating frequency of the graphene is just at a terahertz wave band; and the graphene has soft materials and strong stability on thermodynamics. The above-mentioned statements are physical bases on which the graphene is utilized to replace a traditional metal material as a plated film of a surface of an atomic force microscope probe, so that the above-mentioned limitations are broken through.

The magnetic tape include a non-magnetic support and a magnetic layer including ferromagnetic powder and a binding agent, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference (L_99.9−L_0.1) between a value L_99.9 of a cumulative distribution function of 99.9% and a value L_0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and an isoelectric point of a surface zeta potential of the magnetic layer is 5.5 or more.

The magnetic tape includes a non-magnetic support; and a magnetic layer, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference L_99.9−L_0.1 between a value L_99.9 of a cumulative distribution function of 99.9% and a value L_0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and an absolute value ΔN of a difference between a refractive index Nxy of the magnetic layer, measured in an in-plane direction and a refractive index Nz of the magnetic layer, measured in a thickness direction is 0.25 or more and 0.40 or less.

The invention relates to a characterization method of an atomic force microscope for a micro-pore structure of a reservoir rock core. The method comprises the following steps of: (1) preparing for a characterization sample to ensure that a reservoir rock sample adapts to the characterization of an atomic force microscope; (2) reconstructing a characterization apparatus to ensure that the atomic force microscope adapt to a characterization reservoir rock sample; and (3) analyzing the data of a characterization image, and analyzing the characterization image to obtain useful information to guide production practice. By using the method, the characterization method of the micro-pore structure of the rock can be more complete and accurate so that the characteristics of a nano-grade structure and a micron-grade structure of a reservoir stratum can be indicated three-dimensionally and clearly, and the method has important scientific and economic significances in evaluating reserves of an oil-gas field or the characteristics of the rock micro-pore structure of the oil-gas field to increase the yield of the oil-gas field.

An atomic force microscope (AFM) tip is used to selectively produce surface enhanced Raman scattering (SERS) for localized Raman spectroscopy. Spectra of thin films, undetectable with a Raman microprobe spectrometer alone, are readily acquired in contact with a suitably gold-coated AFM tip. Similarly, an AFM tip is used to remove sample layers at the nanometer scale and subsequently serve as a SERS substrate for ultra-trace analysis. This demonstrates the interface of an AFM with a Raman spectrometer that provides increases sensitivity, selectivity and spatial resolution over a conventional Raman microprobe. An AFM guiding the SERS effect has the potential for targeted single molecule spectroscopy.

The invention relates to a nano-thermoelectric energy material multi-parameter in-situ quantitative characterization device based on an atomic force microscope, which is used for detecting a micro-area heat conduction coefficient, a Seebeck coefficient and other thermoelectric property parameters of a detected nano-thermoelectric material sample. The device comprises a nano-thermoelectric multi-parameter atomic force microscope in-situ excitation platform and a nano-thermoelectric multi-parameter in-situ detection platform, wherein the nano-thermoelectric multi-parameter atomic force microscope in-situ excitation platform is used for providing a basic hardware platform required in nano-thermoelectric multi-parameter excitation and realizing in-situ simultaneous excitation of a micro-area frequency-tripled heat conduction signal and a micro-area stable-state Seebeck direct current voltage signal of a nano-thermoelectric material; and the nano-thermoelectric multi-parameter in-situ detection platform is used for realizing in-situ real-time detection and data processing of micro-area heat conduction and Seebeck voltage of the nano-thermoelectric material and realizing real-time display of the quantitative characterization results of the micro-area heat conduction coefficient and the Seebeck coefficient. According to the device disclosed by the invention, the nano-detection function of the atomic force microscope, the frequency tripling detection principle of macro-heat conductivity and the test principle of the macro-Seebeck coefficient are combined for establishing a nano in-situ evaluation device which is based on the commercial atomic force microscope and combines the properties of nano-scale heat excitation and thermoelectric multi-parameter detection.

A method of producing a branched carbon nanotube (CNT) is disclosed. The branched CNT is used with an atomic force microscope having a cantilever and a tip and that is able to measure a surface of a substrate as well as an undercut feature of the substrate that protrudes from the surface. A catalytic material is deposited onto the tip of the microscope, and the catalytic material is subjected to chemical vapor deposition. This initiates growth of a primary branch of the branched carbon nanotube such that the primary branch extends from the tip. A secondary branch is then introduced to extend from the primary branch and produce the branched carbon nanotube. The primary branch interacts with the surface of the substrate and the secondary branch interacts with the undercut feature.

A method of assembling arrays of small particles or molecules using an atomic force microscope to define ferroelectric domains includes depositing a ferroelectric thin film upon a substrate forming workpiece, then using an atomic force microscope having a conductive, tip for generating a pattern on this thin film to define desired nano-circuit patterns. Next, exposure of this thin film to a solution containing chemical species which selectively adsorb or accumulate under the influence of electrophoretic forces in selected regions of this thin film.

A process based on the constant-height mode of atomic force microscope for preparing nano-class microstructure with controllable depth and large range of precise sizes features that 3D micro-motion bench and its control circuit is additionally used. The motion of said 3D micro-motion bench in height direction is driven by its control circuit to make the probe tip to prick into the surface of a workpiece to be processed. The deformation amount of cantilever caused by the reactive force received by said probe is detected by optical angular measurer and transmitted to single-chip computer. Said 3D bench is moving continuously in the height direction until the processed depth setting is equal to the difference between the motion amount of said 3D bench in height direction and said deformation amount of cantilever.

The invention discloses a vacuum atomic force microscope and a using method thereof, belonging to the field of micro-topography detecting equipment; the microscope comprises an electron beam launching device, a secondary electron detector, a probe with a cantilever, a piezoelectric ceramics scanner and a feedback controller. When in work, electron beams are irradiated to the cantilever of the probe; as the acting force between the probe and sample atoms causes the cantilever to become deformed; a secondary electron signal changes; the acting force between a pinpoint and the sample is controlled to be constant by the signal feedback; the pinpoint scans the surface of the sample point by point and can image surface topography of the sample. The currently common optical lever does not need to be drawn into the invention; the invention overcomes design difficulty brought about by the conventional atomic force microscope applied in vacuum environment, synthesizes two nanophase material characterization methods which are the advantages of the atomic force microscope and an electronic microscope, and can realize the continuous measuring on the material from millimeter size to the sub-nanometer size.

The present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support, wherein the magnetic layer has a thickness δ ranging from 10 to 80 nm, a product, Mrδ, of a residual magnetization Mr of the magnetic layer and the thickness δ of the magnetic layer is equal to or greater than 1 mA but less than 5 mA, a ratio, Sdc/Sac, of an average area Sdc of magnetic clusters in a DC demagnetized state to an average area Sac of magnetic clusters in an AC demagnetized state as measured by a magnetic force microscope, MFM, ranges from 0.8 to 2.0.

The invention provides a preparation method of a colloid probe for an atomic force microscope. Under the display function of an optical imaging system of an atomic force microscope, an epoxy adhesiveis pasted to the bottom of the front end of a microcantilever by using a motion control system of the atomic force microscope; and a cleaned microsphere is pasted to the center of the bottom of the front end of the microcantilever accurately by the epoxy adhesive to prepare a colloid probe. According to the preparation method provided by the invention, no special three-dimensional micro-motion operation platform is needed; the operation becomes simple and convenient; the practicability is high; the prepared colloid probe has a smooth and clean surface; and the preparation method is applied tobatched preparation of colloid probes in a laboratory.