In:
Journal of Applied Physics, AIP Publishing, Vol. 92, No. 8 ( 2002-10-15), p. 4722-4725
Abstract:
We have fabricated and studied the magnetic properties of the Ni81Fe19/Al2O3/Ni81Fe19 based magnetic tunnel junction sensors. Magnetoresistance (MR) of 35% is achieved with a small applied field ( & lt;10 Oe). The introduction of a hard axis bias field linearizes the MR response. The hysteresis disappears in hard-axis fields greater than 3 Oe, which corresponds to the effective anisotropy field along the easy axis. A sensitivity of 3.5%/Oe has been demonstrated in this linear region. Low-frequency noise measurements indicate that sensor noise is dominated by field-dependent 1/f noise caused by magnetization fluctuations. Finally, a noise level as low as 1 nT/Hz1/2 has been obtained.
Type of Medium:
Online Resource
ISSN:
0021-8979
,
1089-7550
Language:
English
Publisher:
AIP Publishing
Publication Date:
2002
detail.hit.zdb_id:
220641-9
detail.hit.zdb_id:
3112-4
detail.hit.zdb_id:
1476463-5
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