MAMMOS Readout with Magnetic Field Modulation
نویسندگان
چکیده
MAMMOS (Magnetic AMplifying Magneto-Optical System) is one of the highest density readout methods for storage media. The signal is directly amplified on the medium and its amplitude is just the same as that from a long domain. Even at a 0.04 Ilm domain, the signal was large enough. At a 0.2 Ilm packed domain, CNR was more than 50 dB and BER was in the 10-4 range. By employing a MAMMOS readout with magnetic field modulation (MFM-MAMMOS), the signals have both very high resolution and large amplitude characteristics.
منابع مشابه
Spatial Resolution of Domain Copying in a Magnetic Domain Expansion Readout Disk
In a magnetic amplifying magnetooptical system (MAMMOS) disk, the copying process of a magnetic domain from the recording layer into the readout layer is investigated by using a laser spot diameter of 0.66 m. Interference between neighboring bits occurs when the spatial resolution of the copy process is larger than half the domain size. It is observed that a reduction of the readout power from ...
متن کاملQuadri-Value MO Recording Layers for Double-MAMMOS Readout Method
Double-MAMMOS is an excellent method to increase memory density for MO recording. This method modifies the usual MAMMOS technique by applying double recording layers. Written domains in each recording layer can be selectively copied and expanded in a reading layer. By this method, memory density can be doubled. However, it is necessary to record twice, recording separately into two layers. Ther...
متن کاملFrequency-chirped readout of spatial-spectral absorption features
This paper examines the physical mechanisms of reading out spatial-spectral absorption features in an inhomogeneously broadened medium using linear frequency-chirped electric fields. A Maxwell-Bloch model using numerical calculation for angled beams with arbitrary phase modulation is used to simulate the chirped field readout process. The simulation results indicate that any spatial-spectral ab...
متن کاملA sensitive and accurate atomic magnetometer based on free spin precession
We present a laser-based atomic magnetometer that allows inferring the modulus of a magnetic field from the free Larmor precession of spin-oriented Cs vapour atoms. The detection of free spin precession (FSP) is not subject to systematic readout errors that occur in phase feedback-controlled magnetometers in which the spin precession is actively driven by an oscillating field or a modulation of...
متن کاملPrepolarized magnetic resonance imaging around metal orthopedic implants.
A prepolarized MRI (PMRI) scanner was used to image near metal implants in agar gel phantoms and in in vivo human wrists. Comparison images were made on 1.5- and 0.5-T conventional whole-body systems. The PMRI experiments were performed in a smaller bore system tailored to extremity imaging with a prepolarization magnetic field of 0.4 T and a readout magnetic field of 27-54 mT (1.1-2.2 MHz). Sc...
متن کامل