scholarly journals Influence of Recorded Pattern on Background Interference impact in Magnetic Recording

2021 ◽  
Vol 1996 (1) ◽  
pp. 012009
Author(s):  
Nuttapon Chaiduangsri ◽  
Somyot Kaitwanidvilai ◽  
Damrongsak Tongsomporn
Keyword(s):  
Magnetic Recording ◽  
Bit Error Rate ◽  
Signal To Noise Ratio ◽  
Low Frequency ◽  
Areal Density ◽  
Frequency Pattern ◽  
Recording Technology ◽  
Background Interference ◽  
Density Growth ◽  
The Impact

Abstract This paper discusses the impact of background interference on a recorded pattern for heat-assisted magnetic recording technology (HAMR). Several patterns of the background track were examined, with the log bit error rate and signal to noise ratio measured via a spin-stand tester using HAMR head and media. It was found that the low frequency pattern gave the highest BER and SNR loss due to the strong magnetic field from the adjacent tracks. Similar to its practical use, the PRBS pattern also showed high interference. These observations may be used to support HDD areal density growth.

Overcoming the Trilemma Issues of Ultrahigh Density Perpendicular Magnetic Recording Media by L10-Fe(Co)Pt Materials

SPIN ◽  
2015 ◽  
Vol 05 (01) ◽  
pp. 1530002
Author(s):  
Fang Wang ◽  
Hui Xing ◽  
Xiaohong Xu
Keyword(s):  
Thermal Stability ◽  
Magnetic Recording ◽  
Signal To Noise Ratio ◽  
Magnetic Recording Media ◽  
Perpendicular Magnetic Recording ◽  
Materials Engineering ◽  
High Anisotropy ◽  
Superparamagnetic Limit ◽  
Ultrahigh Density ◽  
The Impact

L10-ordered FePt and CoPt (collectively called L10- Fe ( Co ) Pt in this review) have become potential materials for future ultrahigh density perpendicular magnetic recording (PMR) media due to their high magnetocrystalline anisotropy, rendering small grains with high thermal stability. However, PMR media using such high anisotropy faces the well-known trilemma issues among thermal stability, signal-to-noise ratio (SNR), and writability. This paper will provide an overview of the impact of L10- Fe ( Co ) Pt on overcoming the superparamagnetic limit and balancing the trilemma issues for ultrahigh density PMR media. Here the research and development of L10- Fe ( Co ) Pt materials will be presented, from the perspectives of enhancing thermal stability, SNR and writability. Furthermore, we will provide some combined approaches to tackle the challenges in balancing the trilemma issues, focusing on materials engineering.

Outlook for maintaining areal density growth in magnetic recording

1994 ◽  
Vol 30 (6) ◽  
pp. 3797-3800 ◽  
Author(s):  
E. Grochowski ◽  
D.A. Thompson
Keyword(s):  
Magnetic Recording ◽  
Areal Density ◽  
Density Growth

scholarly journals A Semi-Stochastic Propagation Model for the Study of Beam Tilting in Cellular Systems

2008 ◽  
Vol 2008 ◽  
pp. 1-7 ◽  
Author(s):  
Konstantinos B. Baltzis
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Signal To Noise Ratio ◽  
Base Station ◽  
Cellular Systems ◽  
Propagation Model ◽  
Beam Tilting ◽  
Tilting Angle ◽  
Proposed Model ◽  
The Impact

Base station antenna downtilt mitigates interference and improves the downlink performance of wireless systems. A semi-stochastic propagation model is presented and applied to the study of the impact of the base station beam tilting in cellular communications. The two-ray approximation of the proposed model is described analytically. Beam tilting is evaluated in relation to the base station antenna radiation pattern, the antennas height, the propagation environment, the bit error rate, and the signal-to-noise ratio at the receiver front end. Analytically derived expressions for the fading envelopes, the error probability, the optimum tilting angle, and the downlink capacity of a WCDMA system are derived. Theoretical analysis and simulation results are provided to show the characteristics of the model. Comparisons with data in the literature confirm its validity. Furthermore, the effect of beam tilting on system downlink performance in terms of bit error rate and capacity is investigated.

scholarly journals Experimental investigation of the low-frequency impact sound transfer function of lightweight wooden floors via heel drops

Acta Acustica ◽  
2020 ◽  
Vol 4 (6) ◽  
pp. 23
Author(s):  
Yi Qin ◽  
Jin Jack Tan ◽  
Maarten Hornikx
Keyword(s):  
Natural Frequencies ◽  
Impact Force ◽  
Signal To Noise Ratio ◽  
Force Plate ◽  
Low Frequency ◽  
Superior Performance ◽  
High Input ◽  
Low Frequencies ◽  
Transfer Measurement ◽  
The Impact

The lightweight floor is a popular construction choice in buildings despite its poor low-frequency impact sound performance. This is exacerbated by common human activities, such as walking and jumping, that have high input force levels at low frequencies. Therefore, experimental evaluations of the low-frequency impact sound performance of a wooden lightweight floor are of interest to designers and researchers. The aim of this paper is to explore the use of heel drop for impact sound transfer measurement. An impact force plate has been built to accurately measure the heel-drop forces up to 200 Hz and the performances on two types of floors are evaluated. The heel drop has a higher energy level at low frequencies, resulting in higher coherence and signal-to-noise ratio and hence superior performance in characterizing the floors in the frequency range of below 40 Hz when compared to the impact hammer. Interestingly, in the case of a heel-drop excitation, the first natural frequencies of the floor decrease. It is in contrast to when a human is simply standing on it, which resulted in an increase of the natural frequencies upon impact hammer excitation.

USING FIELD DATA FOR THE EVALUATION OF THE IMPACT OF ULTRA-LOW FREQUENCY MOTIONS ON THE FATIGUE OF MOORING LINES

2019 ◽  
Author(s):  
Guilherme Borzacchiello ◽  
Carl Albrecht ◽  
Fabricio N Correa ◽  
Breno Jacob ◽  
Guilherme da Silva Leal
Keyword(s):  
Field Data ◽  
Low Frequency ◽  
Mooring Lines ◽  
The Impact
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