Frequency shift keying by current modulation in a MTJ-based STNO with high data rate

A. Ruiz-Calaforra (1) , A. Purbawati (1) , T. Brächer (1) , J. Hem (1) , C. Murapaka (1) , E. Jiménez (1) , D. Mauri (2) , A. Zeltser (2) , J. A. Katine (2) , M.-C. Cyrille (3) , L. D. Buda-Prejbeanu (1) , U. Ebels (1)

1 SPINTEC - SPINtronique et TEchnologie des Composants
2 Western Digital
3 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information

Spin torque nano-oscillators are nanoscopic microwave frequency generators which excel due to their large frequency tuning range and agility for amplitude and frequency modulation. Due to their compactness, they are regarded as suitable candidates for applications in wireless communications, where cost-effective and complementary metal-oxide semiconductor-compatible standalone devices are required. In this work, we study the ability of a magnetic-tunnel-junction based spin torque nano-oscillator to respond to a binary input sequence encoded in a square-shaped current pulse for its application as a frequency-shift-keying (FSK) based emitter. We demonstrate that below the limit imposed by the spin torque nano-oscillator intrinsic relaxation frequency, an agile variation between discrete oscillator states is possible. For this kind of devices, we demonstrate FSK up to data rates of 400 Mbps, which is well suited for the application of such oscillators in wireless networks

Domaines: Matière Condensée [cond-mat]

A. Ruiz-Calaforra, A. Purbawati, T. Brächer, J. Hem, C. Murapaka, et al.. Frequency shift keying by current modulation in a MTJ-based STNO with high data rate. Applied Physics Letters, 2017, 111, pp.082401. ⟨10.1063/1.4994892⟩. ⟨hal-01586041⟩