3 replies to this topic

[Cmyk Tyk]

A nanometer-sized superconducting quantum interference device (nanoSQUID) is fabricated on the apex of a sharp quartz tip and integrated into a scanning SQUID microscope. A simple self-aligned fabrication method results in nanoSQUIDs with diameters down to 100 nm with no lithographic processing. An aluminum nanoSQUID with an effective area of 0.034 μm² displays flux sensitivity of 1.8 × 10⁻⁶ Φ₀/Hz^1/2 and operates in fields as high as 0.6 T. With projected spin sensitivity of 65 μ_B/Hz^1/2 and high bandwidth, the SQUID on a tip is a highly promising probe for nanoscale magnetic imaging and spectroscopy.

http://pubs.acs.org/....1021/nl100009r

Edited by Cmyk Tyk, 10 September 2011 - 05:09 AM.

[Cmyk Tyk]

The question of how thin cuprate layers can be while still retaining high-temperature superconductivity (HTS) has been challenging to address, in part because experimental studies require the synthesis of near-perfect ultrathin HTS layers and ways to profile the superconducting properties such as the critical temperature and the superfluid density across interfaces with atomic resolution. We used atomic-layer molecular beam epitaxy to synthesize bilayers of a cuprate metal (La_1.65Sr_0.45CuO₄) and a cuprate insulator (La₂CuO₄) in which each layer is just three unit cells thick. We selectively doped layers with isovalent Zn atoms, which suppress superconductivity and act as markers, to show that this interface HTS occurs within a single CuO₂ plane. This approach may also be useful in fabricating HTS devices.
http://www.sciencema...53/699.abstract

Edited by Cmyk Tyk, 10 September 2011 - 05:23 AM.

[Cmyk Tyk]

The BIC houses a 275 channel magnetoencephalography (MEG) unit. The MEG unit is used for imaging the brain by measuring the magnetic fields produced by neuronal electric currents. Because the magnetic fields produced by neuronal currents are so small, the sensors need to be extremely sensitive. Currently, gradiometres connected to Superconducting QUantum Interference Devices (SQUIDs) are the sensor of choice.
The CTF 275 MEG unit, the flagship model from VSM MedTech, has 275 SQUIDs and can acquire 275 channels of MEG and 64 channels of EEG data from different parts of the head simultaneously. The sensors are enclosed in a cryogenic assembly to allow the SQUIDs to be kept at superconducting temperatures. In addition to the MEG imaging unit, the BIC has a real-time processing cluster and a user-friendly control console.
The MEG unit is currently used for studies requiring a higher temporal resolution than that of fMRI. Although the spatial resolution of MEG is not as high as that of fMRI, the spatial resolution is better than EEG. Many epilepsy and cognitive studies are making use of our new MEG technology.
http://www.bic.mni.m.../Facilities/MEG

Edited by Cmyk Tyk, 10 September 2011 - 05:41 AM.

[Cmyk Tyk]

В МГУ создали СКВИДы микронного уровня. Если бы кто нибудь проявил инициативу и поэкспериментировал создав МЭГ не с 306 СКВИДами которые недавно Россия закупила за огромные деньги за рубежом а свой но с 10100000 СКВИДов на МЭГе одновременно то может быть и сбылась бы детская мечта многих по создании миелофона из фильма Гости из будущего. Погодите смеяться.... Вы пробовали создать такой МЭГ а кто нибудь пробовал? Хотя создать мало, надо будет справится с естественными помехами от магнитометров, потом решить проблему помех от черепа для градиометров и магнитометров одновременно. И в конце исключить помехи от глиальных слоёв. Тоесть нужна будет спецпрограмма при больших вычислительных мощностях.
И в конце не известно получится ли, что не менее важно понимать.
К тому же сама фирма Нейромаг выпускающая отечественные МЭГи давно разорилась вроде а значит такие исследования не только дороги но и без государства существовать самостоятельно пока не способны.
www.elekta.com/healthcare_international_elekta_neuromag.php