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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
Currently, the areal density grow in HDD still depends on the reduction of grain number per bit. In order to have less SNR penalty, it has to scale more on the track density rather than the linear density. This work proposed to insert an additional servo recording layer between data recording layer and SUL of conventional PMR media. With high quality continuous servo signals, the dedicated servo recording...
Grain size and grain-size distributions are two parameters that play critical roles in the performance of magnetic recording media, in determining the densities that they support. Smaller magnetically isolated grains lead to less jitter noise, thereby leading to lower BER's and higher areal densities. Similarly, a smaller grain-size distribution indicates fewer larger and smaller grains again leading...
Magnonic crystals (MCs), conceived as the magnetic microwave analog of photonic crystals, have received considerable attention recently due to their potential in a wide range of applications such as microwave resonators, filters and spin logic devices. Compared with conventional single component MCs, bi-component MCs consisting of arrays of one FM material in the matrix of another FM material shows...
Although ionomers posses the ability to self heal after ballistic impact, they cannot heal damage occuring at lower temperatures. The addition of magnetic fillers to ionomers can enable remote heating and thus trigger self healing in situ. We have synthesized ferrite nanoparticles in an optimal size range for RF heating and incorporated these nanoparticles into an ionomer matrix. Damage caused by...
We investigate the switching of electric-field (EF)-controlled magnetic tunneling junction free layer (FL) magnetization assisted by Oersted field using OOMMF (Object Oriented Micro Magnetics Framework). The effects of several physical parameters, such as damping constant, magnetic anisotropy, as well as the EF efficiency and the applied Oersted field on the switching of the free layer magnetization...
Heat Assisted Magnetic Recording (HAMR) has been considered to be the most promising candidate for next generation magnetic recording technology beyond 1.5 Tb/in2 and it may extend the recording density to about 5 Tb/in2. However, it may face challenges to further increase the areal density to 10 Tb/in2 and beyond due to the difficulties to further reduce the thermal spot size of < 50 nm because...
Hysteresis Loop has been investigated for continuous media by using the energy minimization approach. The domain wall energy is included into the total free energy which is being minimized directly to achieve the equilibrium status of the discretized continuous media. The effects of exchange coupling constant on the hysteresis loop also get studied. It is carried out to make a comparison among the...
The paper discusses the magnetization dynamics of spin-torque oscillator with negative Ku under alternative head field for microwave assisted magnetic recording. Magnetization switching of spin-injection layer (SIL) is essential to have the same precession mode of the field generation layer before and after the head field change directions. The SIL needs to be properly chosen in order to have short...
In this paper, we consider iterative detection and decoding for nonbinary low-density parity-check (LDPC) coded partial-response (PR) channels with written-in errors, which are assumed to be the output of a binary symmetrical channel (BSC). We propose a symbol-level BCJR detector to produce directly soft information of nonbinary LDPC code symbols based on a sectionalized joint BSC/PR trellis. Simulation...
Encoders and resolvers are the commonly used sensors to measure the shaft position in motion control applications. Requirements of precise manufacturing and special electromagnetic or optic structures make those sensors expensive. Reduction of cost without degradation of performance is a challenging problem in sensor design. It demands novel and innovative designs to be explored. This paper presents...
Perpendicular magnetic anisotropy L10-FePt/MgO/[Co/Pd]30 magnetic tunnel junctions (MTJs) with ultra-thin L10-FePt layer of thickness 1 to 4 nm were fabricated and studied. The ultra-thin L10-FePt behaved as the free layer while the thicker and harder [Co/Pd]30 behaved as the fixed layer. The interlayer coupling within the MTJ with L10-FePt layer thickness of 4 nm was attributed mainly to magnetostatic...
Spin-torque transfer magnetic random access memory (STT-MRAM) has emerged as a promising non-volatile memory (NVM) technology, which has compelling advantages in scalability, speed, endurance, and power consumption. In this paper, we first propose a resistance distribution based generic channel model for STT-MRAM. We then apply information theory and propose approaches to compute the mutual information...
This paper presents a study of the effect of the magnetic writer field on the performance of the spin torque oscillator (STO) for microwave assisted magnetic recording systems. The effects of the out-of-plane and the in-plane components of the writer field on the field generation layer of the spin torque oscillator are investigated. It is found that the magnetic writer field has significant influence...
Spin transfer torque (STT) MRAM is a promising scalable nonvolatile memory that may have fast speed, long endurance and low power consumption. In order to realize all these advantages, we first review the key requirements for storage materials with perpendicular magnetic anisotropy (PMA). STT-switching current is too high for low-power application due to low-energy efficiency. Among different types...
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