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Displaying 176 - 200 of 204

Mechanisms for the multistep spin reorientation of ultrathin Fe films on Gd

March 31, 2003
Author(s)
A P. Popov, A. V. Anisimov, David P. Pappas
The multistep spin reorientation transition of ultrathin iron films on bulk gadolinium is described theoretically. We find that it is necessary to include cubic terms in the magnetic anisotropy energy expansion in order to explain this phenomenon

Magnetic Thin Film Interlaboratory Comparison

March 1, 2003
Author(s)
Fabio C. da Silva, David P. Pappas, C. M. Wang
A potential low magnetic moment standard reference material (SRM) was studied in an interlaboratory comparison. The mean and the standard deviation of the saturation moment m s, the remanent moment m r, and the intrinsic coercivity H c of nine samples were

Consideration of possible mass and velocity corrections to magnetic experiments

January 1, 2003
Author(s)
Z. Y. Liu, P. A. Dowben, A P. Popov, David P. Pappas
Gadolinium occurs, in natural abundance, as several isotopes. The possible combinations of different gadolinium isotopes dictates that even for a fixed number of atoms in the cluster, clusters of gadolinium atoms will exhibit a range of masses. This and

Spin polarization of injected electrons

May 17, 2002
Author(s)
W F. Egelhoff, M D. Stiles, David P. Pappas, D T. Pierce, J M. Byers, M B. Johnson, B T. Jonker, Jose E. Alvarellos, J G. Gregg, J A. Bland, R Buhrman

Spin Polarization of Injected Electrons

May 17, 2002
Author(s)
William F. Egelhoff Jr., Mark D. Stiles, David P. Pappas, S Alvarado, J Gregg, J Bland, R A. Buhrman, Daniel T. Pierce, J Byers, M Johnson, B Jonker
A recent paper in Science made the claim of 92% polarization for the injection spin polarized electrons from a Ni scanning tunneling microscopy (STM) tip into GaAs(110). Actually they state their result as 92% efficiency for the injection of 100%

Spin Polarization of Injected Electrons

May 1, 2002
Author(s)
William F. Egelhoff Jr., Mark D. Stiles, David P. Pappas, Daniel T. Pierce, J M. Byers, J M. Johnson, B T. Jonker, S F. Alvarado, J F. Gregg, J A. Bland, R Buhrman
A recent paper in Science made the claim of 92% polarization for the injection spin polarized electrons from a Ni scanning tunneling microscopy (STM) tip into GaAs(110). Actually they state their result as 92% efficiency for the injection of 100%

Surface magnetic phase diagram for a semi-infinite ferromagnet

October 12, 2001
Author(s)
Pavel Kabos, David P. Pappas
The phase diagram for the orientation of the surface region is calculated in the parameter space defined by the surface and bulk anisotropy in semi-infinite ferromagnetic systems and in thin ferromagnet films. Surface magnetic canting always occurs when

Second Harmonic Magneto-Resistive Imaging to Authenticate and Recover Data From Magnetic Storage Media

March 1, 2001
Author(s)
David P. Pappas, C S. Arnold, G Shalev, C Eunice, D Stevenson, Steven Voran, Mike E. Read, Erin M. Gormley, James Cash, Ken Marr, James Ryan
A scanning magneto-resistive microscope was developed that allows for high resolution imaging of magnetic tapes and digital media. By using second harmonic detection to remove thermal anomalies we are able to image sufficient lengths of tape for