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San Jose, CA, United States

Hu B.,Northeastern University | Chen Y.,Northeastern University | Yang A.,Northeastern University | Yang A.,Media Business Unit | And 8 more authors.
Journal of Applied Physics | Year: 2012

Piezoelectric films of Pb(Zr 0.53Ti 0.47)O 3 (PZT) were deposited by pulsed laser deposition onto metallic magnetostrictive substrates. In order to optimize the growth of PZT films, a buffer layer of Pt was employed, as well as variation of deposition temperature, pressure, and laser energy. Room temperature -2 x-ray diffraction measurements indicate all diffraction features correspond to reflections indexed to a single PZT phase of space group P4mm. Scanning electron microscopy images reveal pinhole-free dense films of pyramidal shaped crystal arrangements whose orientation and size were controlled by variation of oxygen pressures during deposition. The resulting PZT films had a value of d 33 ∼ 46 pm/V representing a 53 increase over previous efforts to realize a piezoelectric/Metglas film heterostructure. © 2012 American Institute of Physics. Source

Shi Z.,Media Business Unit | Salo M.,Media Business Unit | Zhang J.,Media Business Unit | Yang A.,Media Business Unit | And 2 more authors.
IEEE Transactions on Magnetics | Year: 2011

We developed a new magnetic test to characterize the track overlapping effect in shingled magnetic recording. Media noise power and media noise track profile as a function of track trimming are directly measured on a spinstand tester. Pseudo-jitter and on-track noise depth are introduced as new recording parameters. Their effects on shingled track density are discussed. © 2011 IEEE. Source

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