Micromagnetic optimization of recording systems
Professor Thomas Schrefl
Date: January 7th (Wed), 2015
Time: 10:30 - 11:30
Place: 8th floor medium seminar room (Room 811-812), Sengen
Abstract:
The design of magnetic data storage at 4 Tbit/in2 and beyond requires the simultaneous optimization of head and media properties.
Through numerical optimization techniques multiple parameters can be simultaneously
adjusted, in order to reduce the bit error rate. Using Python as scripting
language we combined a finite element solver with a numerical optimization
tool (https://dakota.sandia.gov/) into a single simulation environment. Thus a wide parameter space was
explored efficiently and automatically. Using the total bit error rate,
which is the sum of the on track and adjacent track error, we optimized
the writer design and the properties of exchange spring bit patterned islands
such as the strength of the exchange coupling and the hard phase anisotropy.
In the talk I will compare the performance of shingled writing, staggered
writing, and centered writing. For shingled write a bit error rate of around
1.5x10-8 was demonstrated numerically.