Frequency losses of readback efficiency for thin-film inductive heads

Author

Zhu, Jun ; Thayamballi, Pradeep

Author_Institution

Read-Rite Corp., Milpitas, CA, USA

Volume

32

Issue

1

fYear

1996

fDate

1/1/1996 12:00:00 AM

Firstpage

84

Lastpage

89

Abstract

Magnetic recording measurements on a rigid disk are used to derive the readback efficiency of thin film inductive heads as a function of frequency. The technique relies on a pseudo-contact air bearing system which keeps the transducer in contact with the disk over a range of velocities. It is found that the readback efficiency decreases monotonically with frequency, showing a 3 dB loss at 40 MHz for the heads used in this experiment. A four section transmission line model has been developed to include the geometry variations in different areas of the head. Domain wall motion and rotational contributions to flux transmission have been included. The calculated efficiency and impedance values are found to be in good agreement with measured values

Keywords

magnetic heads; magnetic thin film devices; transmission line theory; 3 dB; 40 MHz; domain wall motion; flux transmission; frequency losses; impedance; magnetic recording; pseudo-contact air bearing system; readback efficiency; rigid disk; thin-film inductive head; transducer; transmission line model; Frequency measurement; Geometry; Impedance measurement; Magnetic films; Magnetic heads; Magnetic recording; Solid modeling; Transducers; Transistors; Transmission line measurements;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.477555

Filename

477555