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Topic: Recording head

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In the News (Sat 21 Oct 17)

  Storage Technology
Magnetic recording heads are constructed from a variety of materials; magnetic alloys, metal conductors, ceramic and polymer insulators in a complex three dimensional structure with very precise tolerances.
In 2000, nearly 90% of all recording heads manufactured in the industry are estimated to be GMR.
The Recording Head Materials group has an ongoing program to explore these high magnetization pole materials and to address high density recording and the effects of these materials in the design of advanced write heads.
www.hitachigst.com /hdd/research/recording_head/headmaterials   (972 words)

  Recording head - Wikipedia, the free encyclopedia
A recording head is the physical interface between a recording apparatus and a moving recording medium.
Recording heads are generally classified according to the physical priniciple that allows them to impress their data upon their medium.
A recording head is often mechanically paired with a playback head, which, though proximal to, is often discrete from the record head.
en.wikipedia.org /wiki/Recording_head   (229 words)

 Binaural recording - Wikipedia, the free encyclopedia
Typical stereo recordings are mixed for loudspeaker arrangements, and do not factor in natural crossfeed or sonic shaping of the head and ear, since these things happen naturally as a person listens.
Recordings that are done in studios would have little to benefit from using a binaural set up, beyond natural crossfeed, as the spatial quality of the studio would not be very dynamic and interesting.
Recordings that are of interest are live orchestral performances, and ambient "environmental" recordings of city sounds, nature, and other such subject matters.
en.wikipedia.org /wiki/Binaural_recording   (1063 words)

 [No title]
0018-8646/99/$5.00 (C) 1999 IBM Fabrication of magnetic recording heads and dry etching of head materials by R. Hsiao The fabrication of magnetic recording heads is briefly described and compared with the fabrication of semiconductor integrated circuits.
In summary, although the feature size in recording heads still trails behind that of semiconductor integrated circuits, many unique challenges are present in the fabrication of recording heads of higher areal density and better performance.
The coil in a recording head is usually fabricated from Cu, which is another material that is difficult to etch by means of reactive ion etching because of a lack of volatile compounds at low temperatures.
www.research.ibm.com /journal/rd/431/hsiao.txt   (8186 words)

 IBM Research | Almaden Research Center | Science and Technology | Data Storage | Magnetic Materials and Phenomena | ...   (Site not responding. Last check: 2007-10-21)
Conventional tape recording heads have a cylindrically contoured surface with air bleed slots to remove air from the self-acting air bearing that develops when tape is pulled over a cylinder.
The active recording elements are in the recording gap.
High-end tape systems require an ability to read/verify immediately after writing and are usually implemented in a two-module “dual bump” head (Figure 2).The throat height of the recording head is determined by the cylindrical contour, which requires modules to be finished singly or no more than a few at a time.
www.almaden.ibm.com /st/data_storage/mmp/tape/head   (463 words)

 Magnetoresistive Heads Technology Paper
Early recording heads were fabricated by wrapping wire around a laminated iron core analogous to the horseshoe-shaped electromagnets found in elementary school physics classes.
Hence, a new recording head technology is needed to fuel the disc drive industry's continued growth in capacity and performance.
A detailed analysis of a recording system using an inductive head shows that one of its critical limitations is that the recording head must alternately perform conflicting tasks of writing data on the disc as well as retrieving previously-written data.
www.seagate.com /support/kb/disc/mr_heads_tp.html   (1204 words)

 Al Hoagland
I call the arrival of digital magnetic recording a paradigm shift because having heard so far today of the invention of magnetic recording and the early decades of activity you recognize that they were dedicated to the analog recording of sound and music.
That required non-contact spacing between the head and recording medium to avoid wear (the relative surface speed between the two was in the range of 1600 inches a second.) The desire for a high RPM arose both from the short access time sought and the desire for a high data rate.
Shows is the flying head, which generates a self acting bearing from the pressure generated from the boundary layer of air on the disk through the contour design and keeping the head off the surface.
www.mdhc.scu.edu /100th/Progress/Hoagland/alhoagland1.htm   (3993 words)

 Expectations - What to Expect When You Purchase a Head-Cleaners Hypnosis Tape or CD
You can also request a transcript of the recording you are purchasing (or considering purchasing).
Each recording, whether with background or without background, is made up of two separate recordings designed to be listened to together through
It is possible that listening to additional recordings - in a sort of rotation - might multiply the positive effects you get from listening to one.
www.head-cleaners.com /expectations.html   (2059 words)

 Fabrication of magnetic recording heads and dry etching of head materials
Review papers describing the details of recording-head fabrication have been published in the literature [1, 2] Recording heads are usually fabricated on Al /TiC ceramic wafers, which provide excellent mechanical and tribological properties.
It has also been suggested that etching the insulating structure in a controlled manner be used to align the write portion of a magnetic recording head with its read portion [46].
Second, although the coil and pole tip of a head can be more than 3 µm thick, the relatively wide dimensions in recording heads have allowed them to be fabricated by defining features in a relatively thick photoresist layer, followed by electroplating.
www.research.ibm.com /journal/rd/431/hsiao.html   (6801 words)

 Magnetic Recording - an introduction   (Site not responding. Last check: 2007-10-21)
The record head is usually fabricated with a gap size on the order of the thickness of the magnetic coating.
Digital recording at one time was completely dominated by tapes, but today has moved to flexible or rigid disks.
Cassette recorders were first introduced in the early seventies, and by the early eighties -- had essentially supplanted the reel-to-reel recorder in the consumer market.
www.ee.washington.edu /conselec/CE/kuhn/magtape/95x1.htm   (3930 words)

 HEAD acoustics for Noise and Vibration and Telecommunications Voice Quality
HEAD acoustics for Noise and Vibration and Telecommunications Voice Quality
HEAD acoustics, Inc. is responsible for sales and service of HEAD acoustics products and consulting services in North America.
HEAD acoustics provides complete testing systems used in the areas of Sound Quality Evaluation, Noise and Vibration Measurements, Binaural (Aachen Head) Recording and Playback, and Telecommunications Voice Quality and Acoustics Testing.
www.headacoustics.com   (84 words)

 IBM Journal of Research and Development: Fabrication of magnetic recording heads and dry etching of head materials
The fabrication of magnetic recording heads is briefly described and compared with the fabrication of semiconductor integrated circuits.
Recording heads are usually fabricated on Al203/TiC ceramic wafers, which provide excellent mechanical and tribological properties.
After wafer-level processing, in contrast to integratedcircuit fabrication, where chips are obtained by a dicing process, recording-head fabrication relies on many additional complicated processes, such as precise lapping, subsequent thin-film deposition, photolithography, and dry etching, to produce completed recording heads.
www.findarticles.com /p/articles/mi_qa3751/is_199901/ai_n8829691   (1355 words)

 Information Storage Industry Consortium (INSIC) - Cooperative Effort Leads to Magnetic Recording Innovation   (Site not responding. Last check: 2007-10-21)
The problem was that traditional inductive recording heads were rapidly approaching their technological limitations and could not expand enough to handle the new applications.
Early recording heads were fabricated by wrapping wire around a laminated iron core, analogous to the horseshoe-shaped electromagnets found in elementary school science classes.
The heads would need to provide sufficient signal-to-noise detection capabilities so that data could be recorded and read with error rates low enough to enable system performance of not more than one error in 10^14 bits.
statusreports-atp.nist.gov /reports/91-01-0016.htm   (2765 words)

 Head for recording an information signal in and reproducing the same from a semiconductor recording medium (US4592041)   (Site not responding. Last check: 2007-10-21)
Head for recording an information signal in and reproducing the same from a semiconductor recording medium (US4592041)
A hardness of the electrode stylus is lower than a hardness of a surface medium which constitutes the semiconductor recording medium and is higher than a hardness of the supporting substrate.
A head for recording an information signal in and reproducing the same from a semiconductor recording medium comprising:
www.delphion.com /details?pn=US04592041__   (248 words)

 Binaural Recording   (Site not responding. Last check: 2007-10-21)
If we are attempting to emulate the way a pair of human ears hear, one thing we might try would be to construct a model of a human head and place microphones where the ears are.
If carrying a dummy head is not practical, you could try to use your own noggin to simulate a human head and place small microphones either in or near your own ears.
This is not the case - moving your head doesn't mar your recording, but this was a big mental hurtle, and I¼m sure that it is just a question of getting used to the process.
home.sprintmail.com /~markgriswold/articles/stereo/binaural.htm   (823 words)

 [No title]
A recording head serves two functions in a hard-disk drive: it writes data onto a disk as well as reads back that data.
To write, an electrical current sent through a coil induced a magnetic field within the head that was projected through a small gap onto a spinning disk.
IBM made a leap in disk-drive technology in 1991 when it introduced the first hard-disk drive that used an MR reading sensor, which is made of several thin layers of a magnetic material, that changes its electrical resistance in a magnetic field.
www.almaden.ibm.com /almaden/newsrels/spinvalv.html   (804 words)

 Recording_Head_Household   (Site not responding. Last check: 2007-10-21)
Recording a Head of Household for a Census
I use this to put the people in the order I want, I will set the date for the head of household to several days back to ensure that he is the first person in the Census Tags lists on the Person screen.
This creates a linked list of people on the head of households person screen for all the individuals that were enumerated with him/her.
home.earthlink.net /~djebegeman/tmg/Recording_Head_Household.htm   (297 words)

 University of Houston: Center for Nanomagnetic Systems - Patents
Khizroev, B. Crue, “Perpendicular recording head with return poles which reduce flux antenna effect,” US patent 6,798,615, issued September 28, 2004.
Khizroev, D. Litvinov, "Perpendicular magnetic recording head with means for suppressing noise from soft magnetic underlayer of recording media," US patent 6,667,848, issued December 23, 2003.
Litvinov, "Perpendicular magnetic recording system including recording media with a soft magnetic underlayer having a saturation moment higher than the moment of the recording head," US patent application, 60/175,863, filed Jan 12, 2001.
www.egr.uh.edu /cns/patents.htm   (661 words)

 Recording head to optimize high density recording (EP0390347B1)   (Site not responding. Last check: 2007-10-21)
To optimize high density recording by reduction of hooks on ends of transitions, the recording head has at least two poles with a gap section inbetween and configured with the second pole (P2) and gap section (g) being greater in width than the first pole (P1).
Transverse field components are reduced at the head fringes and the transition becomes substantially parallel to gap.
Method for producing head with narrow first pole (P1) includes planarization of first pole area to receive wider gap layer (g) and wider second pole (P2).
www.delphion.com /details?pn=EP00390347B1   (265 words)

 Understanding ESD Issues in Magnetic Recording
The induced potential on an MR head can be amazingly large, since it takes very little charge to produce a large voltage on a small objects.
Magnetic recording engineers must incorporate electrostatic considerations into the design of magnetic recording handling processes, or run the risk of giving undesirable electroshock therapy to MR heads.
Looking to the future, the importance of understanding ESD in magnetic recording will only grow, since the trend is for each new generation of AMR head, as well as the new GMR head, to be even more sensitive to ESD damage than the previous generation recording heads.
www.wallash.com /understa.htm   (3311 words)

 Appendix: Disk Facts   (Site not responding. Last check: 2007-10-21)
A recording head magnetizes microscopic particles on the surface of the recording medium.
The circular recording media (disk or platters) are broken down onto concentric circles of uniform width.
We generally record on both sides of a disk/platter because it makes economical sense.
www.cs.nps.navy.mil /curricula/tracks/security/notes/chap06_34.html   (231 words)

 (WO 03/073445) AMPERE HEAD WITH PERPENDICULAR MAGNETIC FIELD   (Site not responding. Last check: 2007-10-21)
(57) A magnetic head (198) for generating a magnetic field is provided in which first and second electrical contacts (304,306) are electrically coupled to a thin film wire (302).
An electrical current is passed between the contacts (304,306) and through the wire (302) to generate a magnetic field.
A focus mechanism is provided to focus the magnetic field and thereby increase the flux density of the magnetic field along a recording edge (322) of the thin film wire (302).
wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/73445.030904&...   (214 words)

 MRSEC - UCSD - Research Highlights - Quartz Tuning Fork Magnetic Sensor for Recording Head and Media Testing   (Site not responding. Last check: 2007-10-21)
We have developed an inexpensive, small sized device for complete recording head and media testing.
By attaching a sharp magnetic probe to one of the tines of the tuning fork, this simple device can be used for testing and evaluation of the magneto-resistive read elements and the inductive write gaps of recording heads during the fabrication process.
Point of response of magneto-resistive element of modern recording head.
mrsec.ucsd.edu /research/highlights/qrtzfork.html   (218 words)

 Santa Clara University   (Site not responding. Last check: 2007-10-21)
HEAD PERFORMANCE: Electrical head performance and head testing.
Besides doing research in the areas of micro-electromechanical systems (MEMS), the institute is heavily involved in research on recording heads and has thin film transducer and slider fabrication capabilities.
All students taking courses in the School of Engineering agree, individually and collectively, that they will neither give nor receive unpermitted aid in examinations or other course work that is to be used by the instructor as a basis of grading.
www.ee.scu.edu /classes/1999summer/elen479   (206 words)

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