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Topic: Magnetic recording tapes

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	Magnetic Recording Measurements 2002
		Magnetic imaging techniques and measurements are developed for the authentication of recorded information and the recovery of data from samples of damaged magnetic recording media.
		The magnetic properties of the samples have been measured in a B-H looper and a SQUID magnetometer to verify that the superconducting loop is continuous and functional.
		Technical leaders in the recording tape industry met at NIST laboratories in Boulder, Colorado, to outline directions for tape technology during the next decade in the areas of read and write channels, heads, media, and tape transport.
	www.boulder.nist.gov /div818/81803/2002/MagneticRecordingMeasurements (1579 words)

	Biasing in Magnetic Tape Recording
		A high frequency bias signal is typically applied to the tape through the tape head along with the music signal to remove the effects of this magnetic history.
		Magnetic emulsions made with chromium dioxide require a larger biasing signal to make use of their wider dynamic range, so modern recorders have different bias settings for iron oxide, chromium dioxide, and metal tapes.
		With optimum biasing, the recorded magnetic image is proportional to the signal current applied to the record head.
	hyperphysics.phy-astr.gsu.edu /hbase/audio/bias.html (365 words)

	Magnetic Recording Equipment (Site not responding. Last check: 2007-10-09)
		Although magnetic recording is almost ideally adapted to such service, and although telephone recorders have been manufactured in Europe for many years, the Ipsophone is the first device in which the many technical problems involved seem to have been solved to satisfaction.
		It is designed for double-channel recording, one recording being made on the upper portion of the tape when the tape is moving in one direction, and the other recording being made on the lower portion of the tape when the tape moves in the reverse direction.
		Recordings may be made either from a crystal microphone, supplied with the unit, or from a phonograph pickup or the detector stage of a radio.
	history.acusd.edu /gen/recording/begun6.html (9170 words)

	3M Innovation Chronicles -- 3M Magnetic Tapes (Site not responding. Last check: 2007-10-09)
		3M is no longer in the magnetic tape business, but the development of magnetic tape technology still stands as a proud chapter in the history of innovation - and as an unparalleled example both of 3M's patience and of its speed and flexibility in research.
		A high-quality magnetic iron oxide had to be developed, and reliable processes for dispersal and coating had to be designed.
		Recordings on disc technology were inadequate because of cutting and editing difficulties.
	www.3m.com /about3M/pioneers/magnetic.html (592 words)

	Statement of Work Specifications (Site not responding. Last check: 2007-10-09)
		Magnetic recording tapes covered by this specification is intended for use on digital cartridge transports using 38,000 BPI recording method (3480 cartridge) and digital cartridge transports using 76,000 BPI recording method (3490E cartridge).
		The tape must be compatible with other tapes, i.e., the tape shall not contaminate the evaluator and/or tape drive to affect the use of subsequent tapes on the same equipment.
		Tape must be able to withstand, without loss of data or other failures, a storage temperature ranging from 40 to 90 degrees Fahrenheit (throughout the manufacturer's warranty period).
	www.uspto.gov /web/offices/ac/comp/proc/specs.html (1492 words)

	Carrier foil for a magnetic recording tape, and method of manufacturing same - Patent 4318957
		A magnetic recording tape carrier foil comprising a thermoplastic synthetic resin foil bearing a magnetizable coating, characterized in that in the longitudinal direction the foil has a Young's modulus E.sub.1 of at most 4000 N/mm.sup.2 and in the transverse direction the foil has a Young's modulus of at least 1.3 E.sub.1.
		It is the object of the invention to provide a carrier foil for a magnetic recording tape which may be very thin and is less liable to form curls, buckles or wrinkles during use of tensilized tapes.
		A carrier foil for a magnetic recording tape according to the invention is characterized in that the foil in the longitudinal direction has a Young's modulus E.sub.1 of at most 4000 N/mm.sup.2 and has a Young's modulus of at least 1.3 E.sub.1 in the transverse direction.
	www.freepatentsonline.com /4318957.html (1333 words)

	Polyethylene-2,6-naphthalate film for magnetic recording tapes - Patent 4804736
		Disclosed herein is a polyethylene-2,6-naphthalate film suitable for magnetic recording tapes and, in particular, a polyethylene-2,6-naphthalate film suitable for a base film of high-density magnetic recording tapes, having a Young's modulus of not less than 800 kg/mm.sup.2 in the machine direction (the longitudinal direction) and of not less than 600 kg/mm.sup.2 in the transverse direction.
		Especially, when a magnetic recording tape is manufactured by forming a magnetic layer on a base film by deposition, a film which has higher heat resistance than a terephthalate film has been demanded.
		If the strength in the transverse direction is low, a magnetic recording tape formed of such a film of, e.g., not more than 7.mu.m thick is likely to be wrinkled at the edge, or to be broken or bent during running in a recording apparatus.
	www.freepatentsonline.com /4804736.html (4516 words)

	Magnetic Recording - an introduction
		It is important that the magnetic media chosen has a small enough spatial resolution to be able to support the desired frequency range at the given velocity.
		Digital recording at one time was completely dominated by tapes, but today has moved to flexible or rigid disks.
		The tape is held tightly to the capstan by means of a pinch roller.
	www.ee.washington.edu /conselec/CE/kuhn/magtape/95x1.htm (3930 words)

	Magnetic Recording - an introduction
		In magnetic recording, the magnetic media is often not completely saturated.The external magnetic fields (H) are held below the maximum fields forsaturation, and the induced magnetization (M) is correspondingly less.Thus, the induced remanent magnetization is less that the maximumMr(infinity).
		Particulate magnetic media are most commonly used in audio tape applications.In order to insure recorder and reader compatibility, the ac bias, signalcurrent and frequency equalization have been standardized.
		Reel-to-reel tape recorders were developed in the late 1940s and early 1950s.Although reel-to-reel machines have been almost completely supplanted bycassette recorders in the consumer market, they are still in use as studio andprofessional machines.
	www.ee.washington.edu /conselec/CE/kuhn/taperecord/tape.htm (3639 words)

	Magnetic Recording Measurements 2001
		It has published definitive work on magnetic reorientation transition of ultra-thin (two atomic layers) films of iron on gadolinium as well the magnetic phase transition of the atomically clean gadolinium surface.
		These sensors are used to map the microscopic magnetic fields across samples, thereby allowing investigators to reconstruct the original signal and gain insight into the recording process and history.
		The effects of planarization of the spacer layers between the magnetic and super-conducting films is ongoing.
	www.boulder.nist.gov /div818/81803/2001/MagneticRecordingMeasurements (1661 words)

	History of Magnetic Recording (Site not responding. Last check: 2007-10-09)
		And maybe it would be possible to magnetize a wire to different degrees so close together that sound could be recorded on it by running the current from a microphone through an electromagnet and by either drawing the wire rapidly past the electromagnet or drawing the electromagnet rapidly past the wire.
		Then, by placing the recording head, which now served as a reproducing head, at the beginning of the wire spiral and playing the record through again, the original message was heard, as the varying magnetization of the wire generated current in the windings of the electromagnet.
		Magnetic recording was ripe for "rediscovery." Electronic amplifiers, the key to the great problem of sufficient output level, were coming into general use, and even without the use of a-c biasing, it was possible to make quite satisfactory magnetic recordings and play them back at any desired volume.
	history.acusd.edu /gen/recording/begun1.html (5306 words)

	Prerequisites for magnetic recording
		A recording medium is any material that has the ability to become magnetized, in varying amounts, in small sections along its entire length.
		Magnetic heads are the heart of the magnetic recording process.
		When a recording medium is passed through this fringing field, it is magnetized in relation to the electric current.
	www.tpub.com /neets/book23/96a.htm (459 words)

	Howstuffworks "How Tape Recorders Work"
		Magnetic recording is a backbone technology of the electronic age.
		In the video realm, video tape is used widely both in the broadcast industry and at home to store material for later viewing on VCRs.
		In the computer realm, magnetic recording is used on floppy disks, hard disks and magnetic tape as the main method for data storage.
	www.howstuffworks.com /cassette.htm (165 words)

	List of Publications - Dr. Edward Della Torre - IMR
		Wide range of publications including pivitol Preisach modeling papers, magnetic aftereffect and accomodation papers, and publications dealing wth the numerical solutions of field problems and optimal design of devices, the theory of operation of magnetic devices such as magnetic bubbles, recording systems and memories, and micromagnetic and phenomenological modeling.
		Della Torre, "The influence of magnetic tape on the field of a recording head," RCA Rev., 21, Mar. 1960, pp.
		Vajda and E. Della Torre, "Scalar characterization of magnetic recording media (invited)," Nanophases and nanocrystalline structures, R. Shull and J. Sanchez ed, TMS: Warrendale, PA, 1993, pp.
	www.gwu.edu /~imr/publications/torre.htm (6652 words)

	Index of 3M "SoundTalk" Bulletins
		B31: The Effect of Coating Thickness on the Frequency Response of Magnetic Tape, by R. von Behren, undated
		B32: Mechanical Considerations in the Use of Thin Base Recording Tapes, by R. von Behren, undated
		B35: Physical Limitations of Magnetic Tape, by A. Persoon, undated
	www.aes.org /aeshc/docs/3mtape/soundtalkindex.html (422 words)

	Sinan Muftu's web page (Site not responding. Last check: 2007-10-09)
		Models capable of analyzing two-sided contact of thin structure such as magnetic recording tapes, paper webs, and photographic films have yet to be presented.
		These results demonstrate that substrate bending is an important stress reducing phenomenon for typical two-side magnetic tape contact problems.
		Here it is shown that substrate bending is an important phenomenon for all industrial tape thicknesses and tensions, however large thickness values exists for which substrate bending is negligible and elastic half-space solutions applied to both sides of the tape are adequite.
	www.coe.neu.edu /~smuftu/JJagodnik.html (232 words)

	MRL Calibration Tapes
		Many other technical papers on magnetic recording are also available online.
		Tape Flux Measurement Revisited, explains both an ac and a dc flux measurement in detail, with examples.
		Topics include the design of magnetic recording heads; the magnetic erasing, recording, and reproducing processes; signal and noise considerations; frequency and wavelength response, measurements, standardization, etc; audio systems and practices; program level indicators; tape transport design, flutter measurement, etc; and miscellany.
	home.flash.net /~mrltapes (1627 words)

	SBIR/STTR Interactive Topic Information System (SITIS)
		Their market is fast approaching the $1 billion dollar mark in the US alone.
		There are several military and non-military applications for nanoparticles, which underlines the urgent need to characterize their behavior in the environment: Automotive catalyst supports, biodiagnostics, chemical-mechanical polishing (CMP) slurries for silicon wafer polishing, magnetic recording tapes, optical fibers, sunscreens, photocatalysts, orthopedic products, optical devices, enhanced LCD screens, polymer composites, etc.
		Riffle, Judy S., “SEEDLING Proposal to Establish Pilot Data for a Consortium on Magnetic Nanoparticle Assemblies: A New Tool for Drug Delivery, Sensors and Electronic Devices,” VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF CHEMISTRY, Report Number: TR-30971 (2003) -AD Number: ADA418026 5.
	www.dodsbir.net /Sitis/archives_display_topic.asp?Bookmark=20029 (570 words)

	Chris Trask: Hysteresis References (Site not responding. Last check: 2007-10-09)
		Ahmend, N., B.K. Middleton, and C.D. Wright, "A Simple High Field Hysteresis Loop Plotter for Magnetic Recording Tapes," Measurement Science and Technology, Vol.
		Fay, H., "Magnetic Hysteresis Loop Tracer Using Operational Amplifiers," The Review of Scientific Instruments, Vol.
		If you have any additional references on this subject, please Email them to christrask@earthlink.net _==_ / and they will be added to this resource list.
	home.earthlink.net /~christrask/hysteres.html (362 words)

	Blank Tapes (Site not responding. Last check: 2007-10-09)
		If you need Services, we can provide you with Computer and Engineering Services as well.
		Sound Track Professional Magnetic recording tape, Splice free, Silicone coating for lifetime Lubrication 1200 ft.(365m) Acetate, Fully Guaranteed.
		Set of 5 - TDK D60 - 60 Minute Tapes.
	www.marketpriceusa.com /prod04-01.htm (181 words)

	News: Deals: Reports (Site not responding. Last check: 2007-10-09)
		Manufacture filtration products for the separation, purification and clarification of liquids and gases
		Packaging paper & plastics film,coated & laminated; Photographic equipment and supplies; Electronic components, nec; Magnetic and optical recording media; Plastics products, nec; Dental equipment and supplies
		Manufacture coated paper, copying paper, adhesive tapes, abrasives, roofing granules, photographic film and magnetic recording tapes, dental products
	money.cnn.com /news/deals/mergers/reports/864088020.html (155 words)

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