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井土 宏*; 福間 康裕*; 高橋 三郎*; 前川 禎通; 大谷 義近*
Physical Review B, 89(8), p.081308_1 - 081308_5, 2014/02
被引用回数：25 パーセンタイル：70.44(Materials Science, Multidisciplinary)We have succeeded in fully describing dynamic properties of spin current including the different spin absorption mechanisms for longitudinal and transverse spins in lateral spin valves, which enable one to elucidate intrinsic spin transport and relaxation mechanisms in the nonmagnet. The deduced spin lifetimes are found independent of the contact type. From the transit-time distribution of spin current extracted from the Fourier transform in Hanle measurement data, the velocity of the spin current in Ag with Py/Ag Ohmic contact turns out much faster than that expected from the widely used model.
福間 康裕*; Le, W.*; 井土 宏*; 高橋 三郎; 前川 禎通; 大谷 義近*
Nature Materials, 10(7), p.527 - 531, 2011/07
被引用回数：164 パーセンタイル：97.37(Chemistry, Physical)The non-local spin injection in lateral spin valves is strongly expected to be an effective method to generate a pure spin current for potential spintronic application. However, the spin-valve voltage, which determines the magnitude of the spin current flowing into an additional ferromagnetic wire, is typically of the order of 1
V. Here we show that lateral spin valves with low-resistivity NiFe/MgO/Ag junctions enable efficient spin injection with high applied current density, which leads to the spin-valve voltage increasing 100-fold. Hanle effect measurements demonstrate a long-distance collective 2
spin precession along a 6-m-long Ag wire. These results suggest a route to faster and manipulable spin transport for the development of pure spin-current-based memory, logic and sensing devices.
