Journal
PHYSICAL REVIEW B
Volume 80, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.060404
Keywords
boron alloys; cobalt alloys; iron alloys; magnesium compounds; magnetic tunnelling; manganese alloys; microwaves; platinum alloys; ruthenium; spin dynamics
Funding
- CNRS
- ANR [PNANO-06-067-04]
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We demonstrate the strong impact of the oscillator nonlinearity on the line broadening by studying spin-transfer-induced microwave emission in MgO-based tunnel junctions as a function of both the injected dc current and the temperature. In addition, we give clear evidences that the intrinsic noise is not dominated by thermal fluctuations but rather by the chaotization of the magnetic system induced by the spin transfer torque. A consequence is that the spectral linewidth is almost not reduced in decreasing the temperature.
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