The Effect of Conducting Gap Spacers on the Impedance of Magnetic Heads

Otto R. The Effect of Conducting Gap Spacers on the Impedance of Magnetic Heads. J Audio Eng Soc. 1972;20(4):258-264. Available from: https://aes.org/publications/elibrary-page/?id=2079

@article{Otto1972_2079,
  author = {Otto, Rudolf},
  title = {{The Effect of Conducting Gap Spacers on the Impedance of Magnetic Heads}},
  journal = {Journal of the Audio Engineering Society},
  volume = {20},
  number = {4},
  pages = {258--264},
  year = {1972},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=2079}
}

TY  - JOUR
TI  - The Effect of Conducting Gap Spacers on the Impedance of Magnetic Heads
AU  - Otto, Rudolf
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 20
IS  - 4
SP  - 258
EP  - 264
PY  - 1972
DA  - 1972/05/06
UR  - https://aes.org/publications/elibrary-page/?id=2079
PB  - Audio Engineering Society
LA  - en
AB  - The impedance of magnetic recording heads at high frequencies is reduced by making the gap spacer of conducting material, because eddy currents in this conductor lower the permeance of the gap region. The traditional formulas for the complex permeability versus frequency of a conducting lamination (as used in transformer design) apply within the gap area. The formulas involve spacer initial permeability, resistivity, and the gap depth which corresponds to the usually used lamination thickness. Measurements of impedance versus frequency of a large -model- head verify the theory.
ER  -