Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3212870
Keywords
boron alloys; cobalt alloys; copper; demagnetisation; ferromagnetic resonance; iridium alloys; iron alloys; magnesium compounds; magnetic thin films; magnetic tunnelling; manganese alloys; perpendicular magnetic anisotropy; ruthenium; silicon; silicon compounds; tantalum
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Funding
- IBM T. J. Watson Research Center
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Thermal-magnetic noise at ferromagnetic resonance (T-FMR) can be used to measure magnetic perpendicular anisotropy of nanoscale magnetic tunnel junctions (MTJs). For this purpose, T-FMR measurements were conducted with an external magnetic field up to 14 kOe applied perpendicular to the film surface of MgO-based MTJs under a dc bias. The observed frequency-field relationship suggests that a 20 A degrees CoFeB free layer has an effective demagnetization field much smaller than the intrinsic bulk value of CoFeB, with 4 pi M-eff=6.1 +/- 0.3 kOe. This value is consistent with the saturation field obtained from magnetometry measurements on extended films of the same CoFeB thickness. In-plane T-FMR on the other hand shows less consistent results for the effective demagnetization field, presumably due to excitations of more complex modes. These experiments suggest that the perpendicular T-FMR is preferred for quantitative magnetic characterization of nanoscale MTJs.
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