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Effects of uniaxial stress on the magnetic properties of thin films and GMR sensors prepared on polyimide substrates by Berkem Özkaya; Srinivasa Rao Saranu; Senthilnathan Mohanan; Ulrich Herr is a Materials Science article available to read on EtoBox.

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## Abstract The effects of externally applied uniaxial stress on the magnetic properties of Co thin films and pseudo‐spin‐valve (PSV) structures on flexible polyimide substrates were investigated. The advantage of the polyimide substrate is its flexibility and high elasticity (∼1%), which cannot be achieved using conventional crystalline substrates. The Co layers exhibit a macroscopic easy axis induced by the preparation process. When the stress is applied perpendicular to the induced in‐plane easy axis, the magnetic domains in the film rotate towards the applied stress direction, which was confirmed using Kerr microscopy and magneto‐optical Kerr effect (MOKE) magnetometer measurements. A Co/Cu/Ni PSV system was prepared on polyimide substrate with dc magnetron sputtering. Applying uniaxial stress leads to opposite rotation of the magnetisation directions in both layers to each other due to different signs of the magnetostriction coefficients of Co and Ni. The magnetisation and giant magnetoresistance (GMR) curves under applied stress were recorded using in situ MOKE and current in‐plane four‐point probe techniques, respectively. When the stress is applied perpendicular to the exte

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Author

Berkem Özkaya; Srinivasa Rao Saranu; Senthilnathan Mohanan; Ulrich Herr

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley; Wiley - V C H Verlag GmbbH & Co. (ISSN 0031-8965)

Published

2008

Language

EN

Field

Materials Science (Physical Sciences)