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The spin-stand imaging technique is further extended to use the pre-existing servo marks on commercial hard disk media for greater scanning precision, which is necessary for track densities above 100 kilo-tracks-per-inch. This reduces the nonrepeatable run-out due to spindle vibration that can significantly distort spin-stand images acquired from commercial disks removed from their native environments. By driving a piezoelectric transducer with feedback derived from the prewritten servo marks, greater accuracy is achieved and demonstrated. Additionally, a technique for measuring the spin-stand imaging head response function and its application for imaging of recorded bit patterns in the context of perpendicular recording is described. [ABSTRACT FROM AUTHOR]

Presents a study which examined the effect of the external magnetic field upon the injection of a spiraling electron beam into a magnetoplasma and gun environment. Experimental setup; Observations; Conclusion.

The generalization of the Hilbert transform for three-dimensional magnetic fields in magnetic recording is presented. This generalization is based on the simultaneous use of ‘magnetic charge’ and ‘electric current’ models of the recording media. The Fourier representation of the 2-D Hilbert transform is discussed, along with its unique scaling properties. [ABSTRACT FROM AUTHOR]

The behavior of magnetoresistance in NiFe (permalloy) point junctions was investigated using an STM set-up, where the junction resistance was continuously varied from 108 Ω-10³ Ω. Our results reveal an enhancement of magnetoresistance of more than 80% at one conductance quantum, and the decaying magnetoresistance as one moves away from 12.9 kΩ to either the diffusive regime or the tunneling regime, as supported by independent theories on spin-dependent transport. The suppression of magnetoresistance with incorporation of a 35-nm-thick Au barrier was observed, as well as the dependence of magnetoresistance on the relative orientations of the electrodes. [ABSTRACT FROM AUTHOR]

Presents a study that analyzed magnetic switching characteristics of permalloy elements. Examination of the interisland spacings of the permalloy arrays; Evaluation of the switching distribution of the permalloy elements; Assessment of the topography and magnetic force micrograph of the permalloy element.

Presents a study that compared the topographic and magnetic structures of patterned thin iron film grown on different substrates. Analysis of the scanning tunneling micrograph of the thin films; Examination of the magnetic force micrograph of the thin films; Influence of the substrates on the structure of the thin film.

Presents a study that described an extraction technique of the response function of giant-magnetoresistive head used in spin-stand imaging. Features of the extraction technique; Analysis of the image of the extracted head response function; Assessment of the accuracy of the proposed technique.