FePt-based magneto-optical recording medium of mixed

Title: FePt-based magneto-optical recording medium of mixed Author: Dong Kaifeng Degree-granting units: Huazhong University of Science and Technology Keywords: magneto-optical hybrid storage;; perpendicular magnetic recording media;; FePt-based films;; micromagnetic Abstract:
Magneto-optical hybrid storage technology can break the limit of ferromagnetic materials, superparamagnetic limit, which greatly improved the hard disk neodymium magnets recording density. It benefits
Coercivity of ferromagnetic materials with the temperature characteristics, the use of laser-assisted thermal magnetic writing, the signal read out the high sensitivity of GMR heads Inspection
Approach to measuring flux. The key to achieve magneto-optical storage is one of mixed hybrid magneto-optical recording media research and development, this focus on
FePt-based magneto-optical hybrid recording media research and preparation, completion of major studies, including:
Record for the magneto-optical characteristics of mixed
And requirements, prepared by rf magnetron sputtering a different series of FePt films, the films by vacuum annealing heat treatment
Formed L1_0 ordered structure, measurement and analysis of the different sputtering conditions by state and after annealing the film properties and microstructure characteristics
Include: different Ag film thickness and the bottom of the vertical orientation of the FePt single layer film effects; different cooling rates and different retirement annealing
Fire time magnetic properties of FePt film; http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php different film structure of [Fe / Pt] _n and [FePt / Ag] _ (10) Magnetic multilayers studied
; Ni doping on the FePt magnetic properties and Curie temperature. Test results show that: the preparation of FePt single-layer and Ag / FePt bilayers with
Good vertical orientation; annealing process of the cooling rate can significantly affect remanence squareness; Fe / Pt multilayer films can effectively reduce
Ordering temperature of FePt films; by Ni doping method can effectively reduce the Curie temperature of FePt film.
Micro-magnetic method
To simulate the magnetization flip FePt film, the description of a magnetic flip magnetic moment at different times during the distribution of the film
Perpendicular coercivity changes in the relationship with the angle θ (θ is the easy magnetization axis and the angle between the field), and the coercivity with particle size relationship;
Simulated [FePt / X] _ (10) (where X is a non-magnetic material) multilayer film thickness changes in the X multilayer coercivity of the impact; in this
Based on the study of particle size on the noise parameters of the transition zone, the noise parameters of the transition zone, including the transition zone width, perpendicular to the
Record length and location of the track direction of the associated offset parameters. The results show that: FePt single-layer magnetic thin film flip line SW model; with
The grain size increases, the film coercivity gradually reduced, the transition zone noise increases. Degree Year: 2009