Improvement of MFM tips using Fe-alloy-capped carbon nanotubes

Yoshida, Nobuyoshi; Arie, Takayuki; Akita, Seiji; Nakayama, Yoshikazu

doi:10.1016/s0921-4526(02)00883-9

Cited by 16 publications

(8 citation statements)

References 4 publications

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“…Here, the magnetic moment of the sensor interacts with the sample’s magnetic stray field. A couple of experimental studies introduce CNT based MFM sensors using, e.g., metal coated CNT [ 151 , 152 ], metal capped CNT [ 153 , 154 , 155 ], or metal-filled CNT [ 45 , 46 , 156 ]. Ideally, an appropriate MFM probe would consist of an elongated single-domain needle made from high remanence material [ 157 ].…”

Section: Applicationsmentioning

confidence: 99%

Carbon Nanotubes Filled with Ferromagnetic Materials

et al. 2010

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Carbon nanotubes (CNT) filled with ferromagnetic metals like iron, cobalt or nickel are new and very interesting nanostructured materials with a number of unique properties. In this paper we give an overview about different chemical vapor deposition (CVD) methods for their synthesis and discuss the influence of selected growth parameters. In addition we evaluate possible growth mechanisms involved in their formation. Moreover we show their identified structural and magnetic properties. On the basis of these properties we present different application possibilities. Some selected examples reveal the high potential of these materials in the field of medicine and nanotechnology.

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Section: Applicationsmentioning

confidence: 99%

Carbon Nanotubes Filled with Ferromagnetic Materials

et al. 2010

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“…Magnetic nanotubes may be useful for applications such as materials for wearable electronics, [9] cantilever tips in magnetic force microscopes, [10] magnetic stirrers in microfluidic devices, and magnetic valves for nanofluidic devices. [11] The use of nanotubes as connecting pipes in nanofluidic devices has already been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Large‐Scale Synthesis, Annealing, Purification, and Magnetic Properties of Crystalline Helical Carbon Nanotubes with Symmetrical Structures

Tang

Wang

et al. 2007

Adv Funct Materials

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Crystalline helical carbon nanotubes (HCNTs) are synthesized as the main products in the pyrolysis of acetylene at 450 °C over Fe nanoparticles generated by means of a combined sol–gel/reduction method. Transmission electron microscopy (TEM) images reveal that there are two HCNTs attached to each Fe3C nanoparticle, and that the two HCNTs are mirror images of each other. Annealing in Ar at 750 °C and purification by immersion in hot (90 °C) HCl solution do not significantly change the structure of the HCNTs, despite the partial removal of Fe nanoparticles by the latter treatment. The magnetic properties of the as‐prepared, annealed, and purified HCNTs have been systematically examined. The annealed sample shows relatively high magnetization due to the ferromagnetic α‐Fe nanoparticles encapsulated in the HCNT nodes. In the case of HCl treatment, relatively pure HCNTs are obtained by the removal of ferromagnetic nanoparticles from the double‐HCNT nodes. The effects of the amount of catalyst used in the synthesis process on the morphology and yield of the carbon products have also been investigated.

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“…In contrast with MFM, where the smallest-diameter tip is best for imaging, the imaging of subsurface spins in an MRFM experiment requires a tip diameter comparable to the sample depth. , The ideal MRFM tip-fabrication protocol must therefore produce tips having a range of diameters, from approximately 500 nm to below 50 nm. Numerous approaches exist for making a magnetic tip like the one sketched in Figure c with a diameter in this range: electron beam deposition of metals from organic precursors; electron beam deposition of carbon followed by blanket evaporation of metal; − evaporation onto a carbon nanocone or carbon nanotube; , using the magnetic catalyst particle at the end of a multiwalled carbon nanotube; , preparation of metal-filled carbon nanotubes; and dielectrophoretic assembly of magnetic nanorods . Unfortunately these approaches are serial, require significant human control, and yield tips with large device-to-device variation.…”

Section: Resultsmentioning

confidence: 99%

Batch-Fabrication of Cantilevered Magnets on Attonewton-Sensitivity Mechanical Oscillators for Scanned-Probe Nanoscale Magnetic Resonance Imaging

et al. 2010

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We have batch-fabricated cantilevers with ~100 nm diameter nickel nanorod tips and force sensitivities of a few attonewtons at 4.2 kelvin. The magnetic nanorods were engineered to overhang the leading edge of the cantilever and, consequently, the cantilevers experience what we believe is the lowest surface noise ever achieved in a scanned probe experiment. Cantilever magnetometry indicated that the tips were well magnetized, with a ≤ 20 nm dead layer; the composition of the dead layer was studied by electron microscopy and electron energy loss spectroscopy. In what we believe is the first demonstration of scanned probe detection of electron-spin resonance from a batch fabricated tip, the cantilevers were used to observe electron-spin resonance from nitroxide spin labels in a film via force-gradient-induced shifts in cantilever resonance frequency. The magnetic field dependence of the magnetic resonance signal suggests a non-uniform tip magnetization at an applied field near 0.6 T.

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Improvement of MFM tips using Fe-alloy-capped carbon nanotubes

Cited by 16 publications

References 4 publications

Carbon Nanotubes Filled with Ferromagnetic Materials

Carbon Nanotubes Filled with Ferromagnetic Materials

Large‐Scale Synthesis, Annealing, Purification, and Magnetic Properties of Crystalline Helical Carbon Nanotubes with Symmetrical Structures

Batch-Fabrication of Cantilevered Magnets on Attonewton-Sensitivity Mechanical Oscillators for Scanned-Probe Nanoscale Magnetic Resonance Imaging

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