TY - JOUR
T1 - Influence of stripe height on critical current density of spin-torque noise in tunneling magnetoresistive read heads
AU - Endo, Yasushi
AU - Hotta, Akira
AU - Yamaguchi, Masahiro
PY - 2013
Y1 - 2013
N2 - This paper describes the influence of the stripe height on the critical current density of the spin-torque (ST) noise in the TMR heads using the GHz range noise spectra in detail. The critical current density above which the non-thermal fluctuation noise originates from the ST slightly increases, linearly decreases, becomes minimum, and further keeps constant as the stripe height is reduced. This result means that no trend of jc appears for the stripe height. The average critical current density is approximately +4.70 ± 1.1 × 1011 A/m2, suggesting that the non-thermal fluctuation noise by the ST in the TMR head is independent of the stripe height and occurs at the current density of 1011 A/m 2. This result also suggests that this non-thermal fluctuation noise will become a serious problem for the HDD in the near future.
AB - This paper describes the influence of the stripe height on the critical current density of the spin-torque (ST) noise in the TMR heads using the GHz range noise spectra in detail. The critical current density above which the non-thermal fluctuation noise originates from the ST slightly increases, linearly decreases, becomes minimum, and further keeps constant as the stripe height is reduced. This result means that no trend of jc appears for the stripe height. The average critical current density is approximately +4.70 ± 1.1 × 1011 A/m2, suggesting that the non-thermal fluctuation noise by the ST in the TMR head is independent of the stripe height and occurs at the current density of 1011 A/m 2. This result also suggests that this non-thermal fluctuation noise will become a serious problem for the HDD in the near future.
KW - Critical current density
KW - Spin-torque
KW - Thermal mag-noise
KW - Tunneling magnetoresistive (TMR) read head
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U2 - 10.1109/TMAG.2013.2245312
DO - 10.1109/TMAG.2013.2245312
M3 - Article
AN - SCOPUS:84880834237
VL - 49
SP - 3745
EP - 3747
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
SN - 0018-9464
IS - 7
M1 - 6559238
ER -