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Extra resources for Magnetic Materials in Japan. Research, Applications and Potential

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6 recording resolut ion. Fig. 13 (b) shows the reproduced Fig. density analyzer. 8m/s Band Width = 10kHz D=620kFRPI -/«o X3 Q. E •60 < -0 0 3 i 1 i 1 i I I I 5 10 Frequency (MHz) I—I 15 Characteristics measured of reproduced voltage vs. 4/txm could interval than the the d i s t r i b u t i o n of pole head steep had a very in the perpendicular recording magnetic properties minimizing the since is interaction gradient running recording very between strongly of the in the at the edges layer affected for U l t r a - h i g h Density singleof the and of the r e c o r d i n g the a high optimum in a medium Magnetic the With such by bit thickness, field the medium medium.

Be provided of the head Expectations Fig. 4 detect and the the by head, magnetic Recording density for the Fig. 14 video In tape recorder, this figure, horizontal vertical axis, axis. recording times over technology of and flexible the track density while linear For areal hard the the m a g n e t i c density has been per recording improved 30 years, while has been developed to such can be recorded mm density the past information magnetic is given units. 01 105 (tracks/mm) Fig. 14 Transition of t h e recording density of magnetic recording devices and i t s p o s s i b i l i t y in future -47- than 2 10/zm .

Fig. hysteresis used grain medium. to to d e t e r m i n e in following a recording of recording perpendicular that a magnetization the Co-Cr and to the crystalline simulations magnetization in as q u a n t i t a t i v e l y in a technique except magnetization process, layer computer the equivalent or even theoretically method. the interval computer longitudinal direction simulation (head to from the the taken. the v a r i a t i o n s of the distribution of residual Fig. 12 magnetization in the Co-Cr layer -40- of a double-layer medium Fig.

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