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A. S. Jenkins, L. Alvarez, E. San, P. P. Freitas, and R. Ferreira, I acknowledge financial support from Labex FIRST-TF under contract number NR-10-LABX-48-01 and from the ANR project "SPINNET" ANR-18-CE24-0012. Furthermore, I thank all collaborators from different institutions (logos on page iii): For sample fabrication (groups of Shinji Yuasa at AIST, of Ricardo Ferreira at INL and of Ursula Ebels at Spintec), build and support of the PLL adapted to STNOs (Martin Kreißig at TU Dresden), support at the synchrotron facility (PolLux group at the PSI), for discussion and development of theoretical models (Claudio Serpico at the Università di Napoli), measurements of the static noise properties (Aurélie Solignac and Julien Moulin at CEA SPEC), and along with very interesting and fruitful discussions for in, Nanoscale true random bit generator based on magnetic state transitions in magnetic tunnel junctions, vol.9, 2019.

. Le-plus-important and . Vincent, Cros pour son soutien exceptionnel au cours des dernières 3.5 ans, tant sur le plan professionnel que collégial. J'ai toujours pu bénéficier de ta riche expérience, qui m'a toujours impressionnée et façonnée et qui continuera de le faire dans ma future carrière. Outre tes qualités scientifiques extraordinaires, ce sont tes capacités humaines qui font que travailler (mais pas exclusivement) avec toi un vrai plaisir: Ton enthousiasme pour la science

, Thales, a harbor for the collaborative research. A place where people share state-of-the-art research, enthusiasm, creativity and congeniality. A place where academia and industry meet, to the benefit of both. For this spirit, I thank all the people in the lab: From the former directors Frédéric Petroff and Frédéric Nguyen Van Dau and the actual ones Paolo Bortolotti and Vincent Cros to the backbone of the research unit's administration Anne Dussart, Nathalie Lesauvage, and formerly Brigitte Marchand. My former and present office mates Quentin Barbedienne