Interaction of a ring head and double layer media-field calculations

Underlayer magnetization effect on read/write characteristics of perpendicular/longitudinal composite media with ring-type head

“…In perpendicular magnetic recording systems with ring-type heads, the recording characteristics is improved by applying a very thin underlayer(VL) with longitudinal anisotropy [1][2][3][4][5][6][7][8][9]. We previously reported the read/write characteristics of such a double-layered (DL) media / ring-type head system, focusing upon underlay er parameters such as coercivity, Hc(u) [3,9,1l], and pointed out the mechanisms of output enhancement in the system: the "doublelayered (DL)effect [ 4]" for lower Hc(u) media (less than a few tens of Oe ) [1][2][3][4][5][6][7] and the "phase synchronization (PS) effect [9]" for higher Hc(u) media (more than several tens of Oe) [1,2,[8][9][10]. More recently, we investigated the media with further higher Hc(u); e.g., several hundreds of Oe [12,13].…”

Microstructural Study on the Functionally Graded Magnetic Thin Films Prepared by Electroless Deposition

“…We have developed various magnetic thin films such as perpendicular magnetic recording media for high-density magnetic recording systems using electroless deposition and investigated their microstructure-properties interrelationships as well as device performance. [1][2][3] In the perpendicular magnetic recording media, it was found that the double-layered films consisting of different magnetic properties exhibited excellent characteristics, [3][4][5][6] since such a configuration is advantageous in combination with a ring-type head which produces the magnetic field graded in the film thickness direction. Therefore, it is expected that a film with "graded" magnetic properties, i.e., continuous change in magnetic properties which is synchronized to the head field gradient, may achieve even greater performance in read-write processes than the double-layered media which have a "stepwise" change in the magnetic properties in the direction of the film thickness.…”

Electrochemical Studies on the Deposition Process of Electroless CoNiP Films with Graded Magnetic Properties

“…In order to achieve higher performance levels, various composite-type films consisting of different magnetic properties have been proposed. [1][2][3][4][5] We have proposed a novel film system with graded magnetic properties along the film thickness direction, which is expected to exhibit further higher performances. 6 We realized such a film based on the electroless CoNiP 7 and investigated the graded control of magnetic properties and microstructures.…”