Thermal Stability Of Data Storage Magnetic Devices

Abstract

Data is of great importance to man and needs to be stored reliably such that it can be called upon and used at any time. Man has progressed over the years from relying on the brain as a data storage system to magnetic recording systems. Magnetic data storage consists of non-volatile memories (longitudinal or perpendicular recording media) where the information is stored. The perpendicular recording system has become the popular choice in recent times due to its ultra-high storage capacity. In this work we study magnetic thin film of Cobalt ferrite with in-plane and out-of-plane anisotropies as longitudinal and perpendicular media respectively. Different types of magnetic characterization were performed on the samples of interest through VSM and torque measurements. This study shows that films with perpendicular anisotropy are more magnetically stable than those with in-plane anisotropy due to their slow magnetic relaxation. The slow relaxation process is promoted through the demagnetizing field induced by the measurement geometry, which considerably reduces the irreversible magnetic susceptibility making perpendicular recording more suited for magnetic data storage.