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Click to see full image, with diameters of Earth and Jupiter for scale. Credit: NASA/SDO Space weather forecasters are keeping a close watch on a large collection of sunspots that could unleash blasts of energy or charged particles toward Earth in the coming days. Sunspot region 1476, the dark patch resembling the Hawaiian Islands in the photo at left, is located near the center of the sun s face as seen from Earth but has yet to act out in any major way.

Spin valves are essential building blocks in the magnetic sensors of read heads in hard disk drives. They consist of two magnetic layers separated by a non-magnetic layer and act as valves for electrons depending on the relative alignment of the magnetization (spin) in the magnetic layers. With the continuous push to boost the storage density of disk drives, it has become increasingly important to shield each individual sensor from the magnetic flux of adjacent bits