Magnetoresistive heads for helical-scan tape systems

More than 1 Gb/in/sup 2/ recording on obliquely oriented thin film tape

“…Recently, 1 Gb/in 2 areal density in a helical scanning contact recording was successfully demonstrated by using an MR head, overcoming the thermal asperities and the head surface wear [6]. Although much more testing is needed for ensuring the product reliability, we believe such demonstrating will surely lead to practical use of MR heads and realization of higher recording density in the helical scanning tape drive system.…”

Metal Evaporated Media

“…The compatibility of the new sensor technology with the specific head-medium interface had to be demonstrated. A lot of work has been performed to show that both the magnetoresistive heads and metal evaporated media could endure large number of recording passes without significant degradation of the recording performances (Kawakami et al, 2005;Ozue et al, 1999;Soda et al, 2001Soda et al, , 2003. The advantages of anisotropic magneto-resistive sensors over inductive sensors for recording on obliquely evaporated media have been reported by Ozue et al (Fukuda et al, 2000;Ozue et al, 1998Ozue et al, , 1999.…”

“…The tape surface roughness and abrasiveness have also to be minimized to limit head wear and head recession which creates additional spacing loss (Osaki, 2000). This is particularly a concern for the use of metal evaporated tape with magnetoresistive read sensors (Hansen and Bhushan, 2006;Kamatani et al, 1999Kamatani et al, , 2005Ozue et al, 1999). The design of the tape surface roughness thus requires some compromise on the recording performance to achieve sufficient durability and runnability characteristics.…”

“…A lot of work has been performed to show that both the magnetoresistive heads and metal evaporated media could endure large number of recording passes without significant degradation of the recording performances (Kawakami et al, 2005;Ozue et al, 1999;Soda et al, 2001Soda et al, , 2003. The advantages of anisotropic magneto-resistive sensors over inductive sensors for recording on obliquely evaporated media have been reported by Ozue et al (Fukuda et al, 2000;Ozue et al, 1998Ozue et al, , 1999. Using the Co-CoO evaporated medium developed for the tape streamer product (Ozue et al, 1996), they showed that an 11-mm-wide 50 kfci written track could be read with a 12 dB larger signal output using a magnetoresistive sensor instead of the conventional ferrite inductive head.…”

Clear stains and their behavior in helical scan tape systems

“…These include head wear, PTR (Pole Tip Recession), and the accumulation of stains [3]. With the use of MR and GMR heads to achieve higher recording density, these problems are intensified [1], [2]. Head wear and PTR can be eased by employing harder materials for the head base and by optimizing the asperities on the tape [4].…”