Magnetic moment manipulation by a Josephson current

François Konschelle (1) , Alexandre I. Buzdin (1, 2)

1 CPMOH - Centre de physique moléculaire optique et hertzienne
2 IUF - Institut universitaire de France

We consider a Josephson junction where the weak-link is formed by a non-centrosymmetric ferromagnet. In such a junction, the superconducting current acts as a direct driving force on the magnetic moment. We show that the a.c. Josephson effect generates a magnetic precession providing then a feedback to the current. Magnetic dynamics result in several anomalies of current-phase relations (second harmonic, dissipative current) which are strongly enhanced near the ferromagnetic resonance frequency.

Mots clés: superconductor/ferromagnet/superconductor junction; Josephson junction; spin-orbit coupling; magnetization dynamics; Landau-Lifshitz-Gilbert equation

Domaines: Supraconductivité [cond-mat.supr-con]; Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

François Konschelle, Alexandre I. Buzdin. Magnetic moment manipulation by a Josephson current. Physical Review Letters, 2009, 102, pp.017001. ⟨10.1103/PhysRevLett.102.017001⟩. ⟨hal-00333601v3⟩