LOPE@ECE - R&D: Ultrafast Phenomena

Biomagnetism

"The discovery of tunneling between ferromagnetic films and the giant magnetoresistance effect has opened several avenues for pursuing nanoscale magnetic film devices. Not only are the transport and magneto-optical properties of single, nanometer thick films, and superlattices as well as spin injection and the coherent (interlayer exchange) coupling between ferromagnetic films across an intervening nonmagnetic metallic film of fundamental import, but they also have clear implications for storage media and magnetic transistors. The realization and optimization of multilayer spin valve, spin tunneling, or magnetic superlattice structures, in particular, require a detailed understanding of the electrical, structural, and optical characteristics of magnetic films having thicknesses in the range of 0.5–15 nm, an interval in which quantum confinement and domain wall structure exert a profound influence on the magnetic properties of a film."

- Talmadge, J.M., Gao, J., Riley, M.P., Roth, R.J., Kim, S.-O., Eden, J.G., Pudonin, F.A., Mel'nikov, I.V., Applied Physics Letters, 84, 21, 2004. " Magneto-optical Kerr effect in Fe₂₁Ni₇₉ films on Si(100): Quantum behavior for film thicknesses below [similar to] 6 nm"

MOKE response data for FeNi films with 2 ≤d≤ 80 nm and magnetic field strengths up to ~110 G. For these measurements, the external magnetic field was oriented perpendicular to the film magnetization axis but in the plane of the film. The inset illustrates the data for the 2 and 3 nm thick films, magnified and displayed over an extended range.

For the external magnetic field oriented parallel to the magnetization axis of the film. Data are again shown for film thicknesses between 2 and 80 nm and the inset presents a magnified view of the results for the 2, 3, and 4 nm thick films.

Selected Papers:

Talmadge, J.M., Gao, and Eden, J.G., 2004 2nd IEEE International Symposium on Biomedical Imaging: Macro to Nano, v 2, p1514-1515, 2004. " Magneto-optical detection of weak magnetic fields"

Talmadge, J.M., Gao, and Eden, J.G., Lasers and Electro-Optics Society Annual Meeting(LEOS), v 2, p 969-970, 2004. "Modulation technique for sensitive magneto-optical detection of magnetic fields"

Talmadge, J.M., Gao, J., Riley, M.P., Roth, R.J., Kim, S.-O., Eden, J.G., Pudonin, F.A., Mel'nikov, I.V., Lasers and Electro-Optics Society Annual Meeting(LEOS), v 1, p 53-54, 2004. " Anomalous magneto-optical Kerr effect in 1-80 nm Fe₂₁Ni₇₉ films"

Talmadge, J.M., Gao, J., Riley, M.P., Roth, R.J., Kim, S.-O., Eden, J.G., Pudonin, F.A., Mel'nikov, I.V., Applied Physics Letters, 84, 21, 2004. " Magneto-optical Kerr effect in Fe₂₁Ni₇₉ films on Si(100): Quantum behavior for film thicknesses below [similar to] 6 nm"