Article
Materials Science, Multidisciplinary
Masayuki Takagishi, Naoyuki Narita, Yuji Nakagawa, Tazumi Nagasawa, Ryo Osamura, Tomoyuki Maeda, Kenichiro Yamada
Summary: This article reviews the technology of Microwave Assisted Magnetic Recording (MAMR) and its application to hard disk drives (HDDs). It explains the physical principles of MAMR and discusses the key points for applying this technology to HDDs. Despite some difficulties, MAMR shows great potential for application in HDDs.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
Kirill A. Emelyanenko, Alexandre M. Emelyanenko, Ludmila B. Boinovich
Summary: This study investigates the mechanism of structure and properties evolution of a lubricant-infused substrate (LIS) by analyzing the isotherm of disjoining pressure. The findings provide insights into the selection of stable lubricant films in air and water, based on the properties of different LIS components.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Roshan Mathew Tom, Robert Smith, Oscar Ruiz, Qing Dai, David B. Bogy
Summary: A main challenge in Heat-Assisted Magnetic Recording technology is the build-up of contaminants called smear on the near field transducer. In this paper, the role of optical forces originating from the electric field gradient in the formation of smear was investigated. It was found that the smear nanoparticle's refractive index, shape, and volume significantly impact the optical force, and interface conditions also influence the magnitude of the force.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Bor-Yuan Jiang, Kunliang Zhang, Takahiko Machita, Wenyu Chen, Moris Dovek
Summary: Hard Disk Drive read heads switched from GMR to TMR technology to improve signal-to-noise ratio for advanced linear densities. The use of crystalline MgO barriers matched to BCC magnetic layers increased the MR ratios. Enhanced side shielding and reduced shield spacing further improved the track and linear density capabilities of TMR heads. Introduction of two-dimensional recording heads boosted head SNR, but overcoming spin torque noise remains a challenge. Magnetic thermal noise can only be overcome by increasing the moment of the free layer, potentially setting the final density achievable by TMR heads.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Acoustics
Shota Yabui, Takenori Atsumi
Summary: This study proposes a high-bandwidth controller design for the micro-actuator in a dual-stage actuator system, aiming to improve the positioning accuracy of hard disk drives and reduce the required stroke.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Automation & Control Systems
Yu Wang, Long He, Shan Jiang, Tommy W. S. Chow
Summary: An adaptive error tracking method is proposed for HDD failure prediction, which is validated through model estimation and accelerated degradation testing, demonstrating better performance in failure prediction and alarm distance compared to previous methods.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2021)
Article
Engineering, Chemical
Qilong Cheng, Roshan Mathew Tom, David B. Bogy
Summary: Heat-assisted magnetic recording (HAMR) technology uses a laser to assist data writing, but it causes material transfer problem due to temperature difference. This study presents two strategies, mechanical and thermal, to mitigate the material buildup issue. The results are important for the commercialization of HAMR technology.
Article
Engineering, Electrical & Electronic
Guochao Wang, Yu Wang, Xiaojie Sun
Summary: A method based on LSTM network and attention mechanism for multi-instance long-term data classification is proposed to predict HDD failures, achieving better results than other methods through analysis of HDD data from a communication company and Backblaze data center.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Chemistry, Multidisciplinary
Elena A. Shakhno, Quang D. Nguyen, Dmitry A. Sinev, Elizaveta V. Matvienko, Roman A. Zakoldaev, Vadim P. Veiko
Summary: This study applied laser-induced thermochemical recording technology to create nano- and microsized structures on thin films, exploring the relationship between laser parameters and the formed oxide structures. A theoretical model based on oxide formation dynamics was developed, showing promising potential for application to other metals in the photonics industry.
Article
Computer Science, Hardware & Architecture
Fernando D. S. Lima, Francisco Lucas F. Pereira, Iago C. Chaves, Javam C. Machado, Joao Paulo P. Gomes
Summary: Predicting failures in Hard Disk Drives (HDD) is a major challenge faced by industry and academia. Health degree prediction is a popular strategy, but practical details have been neglected in previous works. A framework based on Deep Recurrent Neural Networks (DRNN) was proposed, taking into account the ordinal nature of the problem and different costs associated with mis-classifications.
IEEE TRANSACTIONS ON COMPUTERS
(2021)
Article
Polymer Science
Mujib Ur Rahman, Yonghao Xi, Haipeng Li, Fei Chen, Dongjie Liu, Jinjia Wei
Summary: This study investigated the stability/instability behavior of polystyrene (PS) films of different thickness on silicon substrates, revealing factors such as effective viscosity, solvent strength, and various interactions on the substrate surface that affect the decrement in residual film thickness, growth of holes in the film, and film dewetting. The results showed that the polarity of the rinsing solvent, film thickness, and substrate type impacted the behavior of the polymer film, highlighting the importance of polymer-substrate interactions in determining the overall stability of the PS thin films.
Article
Energy & Fuels
Lin Sun, Xue-Hui Sun, Yong-Chang Zhang, Jun Xin, Hong-Ying Sun, Yi-Bo Li, Wan-Fen Pu, Jin-Yu Tang, Bing Wei
Summary: This study comprehensively investigates the decay processes of CHSB foams with different NaCl concentrations, revealing the mechanisms behind the enhanced foam stability in high salinity conditions.
Article
Thermodynamics
V. Loganayagi, Peri K. Kameswaran
Summary: This article investigates the effects of heat transfer, magnetohydrodynamic, and hall current on two-dimensional incompressible nanofluid flow over a rotating disk. Utilizing a nanofluid model with the nanoparticle fraction model, the study examines the impacts of different nanoparticles on the flow characteristics and heat transfer properties. Results show that variations in nanoparticle volume fraction have a significant impact on density, temperature, and heat transfer rates.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2021)
Review
Engineering, Mechanical
Amit Kumar Rahul, Manoj Kumar Singh, Sandip Saha
Summary: This study investigates the flow behavior of Rabinowitsch fluid in porous media by studying the squeeze film between two porous annular discs. The RFF equations are solved using the small perturbation method, and the characteristics of the annular discs are studied using the Gaussian Quadrature method. The results show that the bearing performance is higher when ω = -0.0002 (dilatants lubricant) and lower when ω = 0.0002 (pseudo-plastic lubricant).
TRIBOLOGY INTERNATIONAL
(2023)
Review
Polymer Science
Song Zhang, Luke A. Galuska, Xiaodan Gu
Summary: Research on thin-film mechanics is hindered by the inherent fragility of thin films and the lack of experimental instruments. By comparing different testing methods, the impact of different substrates and confinement effects on thin-film mechanics can be evaluated. Study of thin-film mechanics will contribute to understanding the structure-property relationships in the field of organic semiconductors.
JOURNAL OF POLYMER SCIENCE
(2022)
Review
Chemistry, Applied
Joanna B. Dahl, Jung-Ming G. Lin, Susan J. Muller, Sanjay Kumar
ANNUAL REVIEW OF CHEMICAL AND BIOMOLECULAR ENGINEERING, VOL 6
(2015)
Article
Biophysics
Lionel Guillou, Joanna B. Dahl, Jung-Ming G. Lin, Abdui I. Barakat, Julien Husson, Susan J. Muller, Sanjay Kumar
BIOPHYSICAL JOURNAL
(2016)
Article
Chemistry, Physical
Joanna B. Dahl, Vivek Narsimhan, Bernardo Gouveia, Sanjay Kumar, Eric S. G. Shaqfeh, Susan J. Muller
Article
Engineering, Electrical & Electronic
Joanna E. Bechtel, David B. Bogy
IEEE TRANSACTIONS ON MAGNETICS
(2011)
Article
Engineering, Chemical
Joanna Bechtel Dahl, David B. Bogy
Article
Engineering, Chemical
Joanna Bechtel Dahl, David B. Bogy
Article
Biochemistry & Molecular Biology
Cristina Rodriguez-Quijada, Joanna B. Dahl
Summary: This study measured the mechanical properties of single microscale apoptotic bodies derived from human blood plasma using non-contact microfluidics, finding that apoptotic bodies are very soft in fluid environments and exhibit lower effective stiffnesses than suspended cells. By achieving closer agreement with linear mechanical theory in a natural fluid environment and low-force regime without hard probes and surfaces, more accurate stiffness measurements were obtained, suggesting the need for new mechanical models to interpret force indentation curves in AFM for accurate extracellular vesicle mechanical properties extraction.
BIOCHIMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS
(2021)
Article
Materials Science, Multidisciplinary
Mi Ho Jeong, Hyungsoon Im, Joanna B. Dahl
Summary: In preparation for the use of extracellular vesicles (EVs) in disease diagnostics and therapeutics, researchers are studying the biological, chemical, and physical properties of EVs. Most studies have focused on nanoscale EVs and their biochemical content, while less is known about the characteristics and mechanical properties of larger microscale EVs. A recent pilot study introduced a non-contact microfluidic technique to measure the stiffness of large EVs (>1 μm diameter). By comparing the stiffness distributions of large EVs derived from glioblastoma cell lines, the study found that EVs from cells with the IDH1 mutation, which disrupts lipid metabolism, were stiffer than those from wild-type cells. Lipidomics analysis supported this finding by showing an increase in saturated lipids in EVs with the IDH1 mutation. These findings suggest that high-throughput microfluidics could be used to distinguish between large EV populations with different biomolecular compositions, contributing to a better understanding of EV biomechanics, particularly microscale EVs.
ADVANCED MATERIALS TECHNOLOGIES
(2023)