[21p-W241-1~21] 10.2 Spin torque, spin current, circuits, and measurement technologies

▲ [21p-W241-16] Stability of out-of-plane precession with the application of a tilted magnetic field in spin torque oscillator having a planar free layer and a perpendicular polarizer

〇(P)ryo hiramatsu¹, hitoshi kubota¹, sumito tsunegi¹, shingo tamaru¹, kay yakushiji¹, akio fukushima¹, rie matsumoto¹, hiroshi imamura¹, shinji yuasa¹ (1.AIST)

Keywords:spintronics,spin torque oscillator

We studied spin torque oscillators having an in-plane magnetized free layer and a perpendicularly magnetized reference layer under various magnetic field angles. Out-of-plane precession was excited at a large bias voltage and changed to in-plane precession when a magnetic field exceeded a critical value. The critical magnetic field increased monotonically with changing magnetic field angle from the in-plane to out-of-plane direction. However, the in-plane component of the critical magnetic field became a constant value. These experimental results are well explained by macrospin analyses.