High anisotropy copt (l1(0) l1(1) phase) magnetic recording media films

... L11 CoPt based magnetic recording media L10 CoPt based magnetic recording media In spite of the many advantages of L10 CoPt as discussed in Section 1.2.4, some challenges to its utilization as magnetic ... L10 CoPt and FePt 1.2.5 L11 CoPt 1.3 Magnetic recording media for next generation 1.3.1 Heat assisted magnetic recording media 1.3.2 Exchange coupled com...

Ngày tải lên: 09/09/2015, 10:19

... distance, r 11 Equation 2 Equation defining magnetization, M 11 Equation Equation defining magnetic induction, B 11 Equation Equation for exchange energy between two spins 11 Equation Equation for ... with the doses of 10 11 and 10 16 ions/cm2 11 7 Figure 4-24 Plan-view TEM on as-deposited samples and samples implanted with argon at 10 11 and 10 16 ions/cm2 doses 11 8 Figure...

Ngày tải lên: 09/09/2015, 10:09

... the x-direction and 127 Chapter Ion Implantation in Magnetic Media: Effect of Mass of Ion Species interaction field along the y-ordinate The peak position along the x-axis in this contour shows ... function of the mass of the ion species It was seen that saturation magnetization (Ms) was reduced to ~0 emu/cc at a fluence of 2 1016 ions/cm2 for antimony ( 121 Sb+) and 5×1016 ions/cm2 for a...

Ngày tải lên: 09/09/2015, 10:09

... magnetic recording media 1.2.3 Challenges for current perpendicular magnetic recording media Magnetic recording media of next generation 1.3.1 Heat assisted magnetic recording media 1.3.2 Patterned media ... of magnetic recording media for high areal density 1.1.1 Thermal stability 1.1.2 Signal-to-noise ratio Magnetic recording media 1.2.1 Longitu...

Ngày tải lên: 11/09/2015, 16:02

... STUDY OF BIT- PATTERNED FePt MEDIA FOR HIGH DENSITY MAGNETIC RECORDING SHREYA KUNDU B.Sc Electronics (Hons), University of Delhi, India A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY ... phase diagram of FePt 32 Figure 2.10 (a) Conventional media and (b) bit patterned media 33 Figure 2.11 Two different approaches of creating patterned m...

Ngày tải lên: 09/09/2015, 11:29

... voltage and temperature effects Keywords: magnetic recording, dynamics, access system, piezoelectric actuators, probability, reliability DYNAMICS AND RELIABILITY OF ACCESS SYSTEM OF HIGH DENSITY MAGNETIC ... He Zhimin Doctor of Philosophy Mechanical Engineering Dynamics and Reliability of Access System of High Density Magnetic Recording A...

Ngày tải lên: 15/09/2015, 17:10

... phenomenon of superparamagnetism whereby magnetic grains behave like paramagnetic atoms at high temperature due to thermal agitation [4] The changes of magnetization configuration in magnetic grains ... information We can change the information stored within magnetic grains by applying a magnetic field to change the state of M A strong uniaxial magnetic field can align M o...

Ngày tải lên: 26/09/2015, 09:56

... Contents Introduction 1.1 Background on Magnetic Recording 1.2 The Magnetic Recording Channel 1.3 Signal Processing in Magnetic Recording 1.4 Nonlinearities ... counterparts This thesis focuses mainly on nonlinearities found in longitudinal recording A dominant and well known nonlinearity found in magnetic recording is termed nonlinear transition shift (NLTS) ... Per...

Ngày tải lên: 27/11/2015, 12:23

... Gage, Heat- assisted magnetic recording by a near- field transducer with efficient optical energy transfer,” Nat Photon 3, 220–224 (2009) W A Challener, Transducer for heat assisted magnetic recording, ” ... apertures for heat- assisted magnetic recording The computations are carried out with the presence of the recording medium The half-bowtie and full bowtie...

Ngày tải lên: 06/05/2014, 08:58

... Multiply/divide Cubic 11 Raised cosine 4Ts Interpolator Raised cosine 12Ts 11 12 Raised cosine 16Ts 15 16 Interpolator MMSE 8Ts 910 5560 Raised cosine 8Ts MMSE 10Ts 1818 14690 Raised cosine 20Ts 19 20 ... recovery employing raised cosine pulse for digital magnetic recording channel is presented The raised cosine interpolator was shown to be superior t...

Ngày tải lên: 21/06/2014, 05:20

... Na 2CO3 , CaCO3, BaSO4 ch dựng CO2 v H2O hóy phõn bit cỏc cht rn ny? Cõu 4: Nh t t tng git n ht 30ml dung dch HCl 1M vo 100ml dung dch cha Na 2CO3 0,2M v NaHCO3 0,2M Phn ng kt thỳc tớnh th tớch CO2 ... Na 2CO3 , CaCO3, BaSO4 ch dựng CO2 v H2O hóy phõn bit cỏc cht rn ny? Cõu 4: Nh t t tng git n ht 30ml dung dch HCl 1M vo 100ml dung dch cha Na 2CO3 0,2M v NaHCO3 0,2M Phn ng kt thỳc tớnh...

Ngày tải lên: 02/06/2015, 13:00

... densities up to 3.5 Tb/in2 [43] 1.7 Heat- Assisted Magnetic Recording The concept of heat- assisted magnetic recording (HAMR) is similar to the concept of magneto-optical recording proposed by Katayama ... by thermal fluctuations but is prevented by an energy 11 barrier given by the product of the magneto crystalline energy and the volume of the magnetic...

Ngày tải lên: 09/09/2015, 08:17

... rigid magnetic recording disks are constructed The important properties for a substrate are high hardness and low density for shock resistance Conventionally, for longitudinal media, mechanically ... exchangecouple with a magnetic layer (recording layer), which was not only meaningful for longitudinal media but also important for future perpendicular media and/or heat...

Ngày tải lên: 14/09/2015, 08:46

... important parameters that characterize a recording system The experimental result of the potential areal density gain of a shingled system against a conventional magnetic recording system will also ... erasure track offset using the corresponding set of read-back TAA data 105 Figure - 11: Actual experimentally derived track erasure values at different AC track offset 105 F...

Ngày tải lên: 02/10/2015, 17:15

... DESIGN OF EFFICIENT CONSTRAINED CODES AND PARITY- CHECK CODES FOR PERPENDICULAR MAGNETIC RECORDING CHANNELS MOULAY RACHID ELIDRISSI (B Sc (Hons.), TELECOM INT) A THESIS SUBMITTED FOR THE ... that the design of efficient and powerful codes is key to designing a high-performance PRML system Therefore, our focus in this thesis is to design efficient co...

Ngày tải lên: 04/10/2015, 15:45