The mechanical properties of magnetic tapes play a critical role in determining the performance and life of tapes. The continuous stiffness measurement (CSM) technique was successfully used to study the contact stiffness, elastic modulus, hardness and creep behavior of two metal-particle (MP) tapes A and B with different binder and head cleaning agents (HCA) in their magnetic layers. For the same tape, the magnetic layer has the highest contact stiffness, elastic modulus, hardness and creep resistance, followed by the backcoat and polyethylene teraphthalate (PET) substrate. Tape B's magnetic layer has higher contact stiffness, elastic modulus, hardness and better creep resistance than tape A's magnetic layer. Larger concentration of HCA and harder binder with better adhesion between binder and particles are attributed to the better mechanical properties for magnetic layer. The CSM nanoindentation creep tests can detect creep in a small volume, making it possible to study the creep of magnetic layers and backcoats.
Available at: http://works.bepress.com/xiaodong_li/69/