Guzik Technical Enterprises Presents
Guzik Technical Enterprises Presents:
Magnetic Recording
Systems and Measurements
by Alexander Taratorin
Until several years ago the evolution of magnetic recording was based on the "scaling" principle: the dimensions of recording heads, head-media separation, magnetic grain size were proportionally reduced in order to achieve higher areal density. Today the situation is different. Scaling is no longer applicable. These days, a good understanding of basic recording phenomena is a necessity for an engineer working in magnetic recording.
The new book of Alexander Taratorin summarizes the most recent developments in the magnetic recording industry: superparamagnetic limit, new developments in longitudinal recording, advances in high data rate, characterization of overwrite, perpendicular magnetic recording and basic magnetic measurements. The book contains more than 300 pages and over 200 illustrations.
Price: U.S. $110
Order this book at Guzik Technical Enterprises
Refer to Guzik part number 99-900000-02.
Content
PREFACE
Chapter I. Overview of Magnetic Recording Components
1.1 Recording system
1.2 Recording media
1.3 Recording head
1.4 Read head
References
Chapter 2. Write and Read Processes
2.1 Recording a transition
2.2 Read back process
References
Chapter 3. Superparamagnetic Limit and Thermal Decay
3.1 Spontaneous reversal of isolated magnetic grain
3.2 Magnetization decay
3.3 Spontaneous magnetization reversal in an external field
3.4 Dynamic coercivity
3.5 Media and head limitations
References
Chapter 4. High Linear Density Recording
4.1 Read-back limitations of high linear density recording
4.2 Transition parameter and percolation limit
4.3 Transition noise (media jitter)
4.4 Hard Transition Shift (HTS) in longitudinal recording
4.5 Non-Linear Transition Shift (NLTS) in longitudinal recording
References
Chapter 5. Track Density
5.1 Track Profile: amplitude, signals and track interaction
5.2 Structure of recorded track
5.3 Off-track capability (OTC) and squeeze ( 747) test
References
6. Channel Encoding and PRML Detection
6.1 Principles of encoding for magnetic recording channels
6.2 Classical Partial Response Maximum Likelihood (PRML) channels
6.3 Principles of maximum likelihood detection
6.4 Advanced PRML channels
6.5 Introduction to soft detection and capacity-approaching codes
References
Chapter 7. Perpendicular Recording
7.1 Perpendicular recording principles
7.2 Write head and perpendicular recording media
7.3 Read-back of perpendicular signal
7.4 Non-Linear Transition Shift (NLTS) and Hard Transition Shift (HTS) in perpendicular recording
7.5 Stray fields and sensitivity to adjacent tracks magnetization
7.6 Underlayer noise
7.7 Skew angle erasure
7.8 Structure of perpendicular track and adjacent track interference
7.9 PRML targets for perpendicular recording
References
Chapter 8. Anti-Ferromagnetically Coupled Longitudinal Media
(AFC Media)
8.1 Principle of anti-ferromagnetically coupled media
8.2 Transition width and noise in AFC media
8.3 Relaxation effects in AFC media
8.4 Laminated AFC media
References
Chapter 9. High Data Rate Recording
9.1 Write Current and head flux rise time
9.2 Transition shifts at high data rate
9.3 Compensation of timing distortions using write current overshoot
9.4 Optimization of overshoot amplitude
9.5 Optimization of overshoot duration
References
Chapter 10. Sources of Overwrite Signal
10.1 On-track overwrite measurement
10.2 On-track overwrite in longitudinal recording
10.3 Spectrum of on-track overwrite signal in longitudinal recording
10.4 Cross-track overwrite signal in longitudinal recording
10.5 Overwrite signal in perpendicular recording
References
Chapter 11. Noise in Magnetic Recording Systems
11.1 Noise sources in magnetic recording systems
11.2 Read head noise
11.3 Media DC noise
11.4 Transition noise
References
Chapter 12. Measurements in Magnetic Recording
12.1 Recording and read-back signals in Guzik testers
12.2 Track profile, write and read width measurements
12.3 Saturation and write current optimization
12.4 Frequency roll-off
12.5 Measurements of Non-Linear Transition Shift (NLTS)
12.6 Measurements of Hard Transition Shift
12.7 Measurement of non-linear amplitude loss (Percolation, Partial Erasure)
12.8 Measurement of GMR read head non-linearity
12.9 Measurement of SNR
References
Appendix 1: Fourier Transform, Convolution and Correlation
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About the Author
Alexander Taratorin received his PhD in Physics in 1986. Dr. Taratorin became the principal scientist at Guzik Technical Enterprises in 1993. While there, he was involved in the development of magnetic test equipment, PRML detection and magnetic measurement algorithms. In 1996 he joined the IBM Research Division at the Almaden Research Center (currently the San Jose Research Center, Hitachi Global Storage Technologies).
His proficiencies include different aspects of magnetic recording physics: PRML channel detection, characterization of non-linear distortions, head and media noise measurements, high data rate recording and perpendicular recording systems.
Dr. Taratorin has several U.S. Patents in the field of magnetic recording. He published papers in IEEE Transactions on Magnetics, the Journal of Applied Physics, and has made numerous presentations at international conferences. Dr. Taratorin taught several courses on Magnetic Recording at Stanford University and Santa Clara University.
Dr. Taratorin wrote several books on magnetic recording. His books PRML: A Practical Approach (1995) and Characterization of Magnetic Recording Systems (1996), published by Guzik Technical Enterprises, became a popular source of reference worldwide. He has also co-authored a well-known textbook entitled Magnetic Information Storage Technology (together with S.X.Wang), published by Academic Press in 1999.
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