Abstract
Magnetic phase change memory (MAG PCM) consists of bits with different magnetic permeability values. The bits are read by measuring their effect on a magnetic probe field. Previously low permeability crystalline bits had been written in high permeability amorphous films of Metglas via laser heating. Here data is presented showing that by applying short laser pulses with the appropriate power to previously crystallized regions they can first be vitrified and then again crystallized. Thus, MAG PCM is rewriteable. Technical issues in processing the bits are discussed and results on thermal modeling are presented.
Highlights
Information in conventional magnetic recording is stored in bits having different directions of residual magnetization
Thermal upsets [1] occur when the thermal energy overcomes the free energy barrier KμV where Kμ is the magnetic anisotropy and V is the volume of the bit
We have previously demonstrated a different approach that does not have the above deficiencies of conventional magnetic recording
Summary
Information in conventional magnetic recording is stored in bits having different directions of residual magnetization. Magnetic phase change memory (MAG PCM), information is stored in bits with different values of magnetic permeability [4,5,6]. The technology of MAG PCM is not affected by a magnetic field or thermal upsets, but writing by diffusing Cu into permalloy is irreversible and is a read only memory. Another important technology for storing information is based on optical media using phase change media. MAG PCM can store information at a higher density than present optical phase change memory by using a near field transducer.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
