We design the new slider for 50% MR head. The new slider have Tri-rail ABS with the MR element on the trailing edge of the center rail. Using the fabricated HGA, constant F.H. over all 3.5" disk rotated in 5400r.p.m. is confirmed. The new slider, have Tri-rail ABS having shallow steps (1.8um) around only center rail. The bleed slot of the new slider is fabricated deep by grinding to reduce excessive air pressurization in high transfer rate application. The new slider have shallow steps only center rail, so widened shallow steps of the new slider reduce the F.H. variance caused by step width variation without roll unbalance. Because the MR element is located on the center line, the pivot point variation in transverse direction cause no significant Gap F.H. variation.

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Soft magnetic properties of Fe-Zr-C-N films fabricated by rf reactive sputtering in Ar+N_2 atmosphere were investigated. The as-deposited films having mixd phases of amorphous and bcc α-Fe or mostly crystaEine α-Fe phase showed nanocrystalline structure upon annealing. The best soft magnetic properties achieved in these films are; H_c of 0.06 Oe, μ_<pff> of 3150 (1MHz) and 4πM_s of 16.8 kG. The films exilibited high μ_<pff> of more than 2000 and 4πM_s. of about 1.6 kG when the Zr content is about 6.4-8.3 at% and the [C+N] cdntent is around 15.5-18.0 at%. The fine grained α-Fe structure, together with very fine Zr(C,N) precipitates which were formed at an early stage of crystallization is considered to be one of the main factors for the excellent soft magnetic propertiesn

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NiFe/Cu artificial superlattices have been fabricated by rf-magnetron sputtering on Si(111) wafer substrates using thin copper layer as an underlayer. 11.7% magnetoresistance at room temperature is observed in a[Cu(22Å)/NiFe(20Å)]_20Cu(50Å)|Si(111) sample and the saturation field is measured to be 100 Oe. The artificial superlattices show in-plane uniaxial anisotropy with the easy axis parallel to the fiat edge direction (// Si<110>) of the wafer. The easy-axis magnetoresistance curve exhibited a multiple stepwise changing behavior and it turned out that the size of the plateau region of steps had a great influence on the saturation field.

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Thin CoCrTa/Cr films were deposited on glass substrates at various temperature with or without Al micro-bumps. The coercivity of CoCrTa increased considerably by introducing the Al micro-bumps as a texture layer. The cause of the coercivity increase is attributed to the development of stronger (1011) texture of Co grains which is related to lattice expansion of Cr underlayer by Al addition to Cr lattice. The Morphology of CoCrTa/Cr/Al films was also observed. The size and shape of Al micro-bumps was very sensitive to the thickness of the Al films and the substrate temperature.

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Effects of Ar pressures and substrate temperatures on magnetic and microstructural properties of Co-Cr films are investigated with an extremely wide Ar pressure range using Ti underlayers. It was found that for films deposited at high Ar pressures, (00・1) Orientation is retained by the underlayer for about 200 um thick, while for those deposited at low Ar pressures, the orientation is govemed by the underlayer for 300-600 nm thick. Higher substrate temperature seems to expand the range of the underlayer effect to a larger thickness. The magnetic properties are affected mainly by the microstructure of the film.

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In overwrite recording on thick recording media, recording dips or so-called "re-recording phenomena" have been observed. In this paper, the overwrite characteristics for thin recording media such as metal evaporated tape are reported. It was experimentally confirrmed that recording dips in over-write characteristics occur for thin media as well as for thick recording media, when some recording conditions were satisfied. To explain the characteristics, the effects of internal field and rotating vectorial head field are discussed.

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This paper provides a study on the track edge writing phenomena with a view to achieve logitudinal recording of submicron track width. A magnetic force microscopy (MFM) observation of the recorded magnetization patterns on thin film media showed that the side writing induced the degraded write resolution at the track edge. An analytical simulation considering the non-saturation recording is utilized to reveal the essence of side writing phenomena. The dependence of head gap length, head-to-medium spacing and head field strength on the write resolution were studied through the simulation and experiments. The feasibility of the submicron track width recording was investigated.

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Increasing of the amount of information by HDTV, the higher recording density of VTR is demanded. While it's necessary to develop a thinner and smoothed out magnetic surface tape, it turns out an important subject to increase the friction between the tape and the fixed drum. The USV(Ultra-Sonic Vibration) drum we have invented produces infinitesimal ultrasonic vibration on the drum's surface and thereby reduces the friction performing recording and reproducing experiments. As a result, the friction coefficient was one thirdor under. The new drum has proved effective in stabilizing tape running.

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