530 research outputs found
Swing switching of spin-torque valves
We propose a method for inducing magnetization reversal using an AC spin
current polarized perpendicular to the equilibrium magnetization of the free
magnetic layer. We show that the critical AC spin current is significantly
smaller than the corresponding DC one. The effect is understood as a
consequence of the underdamped nature of the spin-torque oscillators. It allows
to use the kinetic inertia to overcome the residual energy barrier, rather than
suppressing the latter by a large spin current. The effect is similar to a
swing which may be set into high amplitude motion by a weak near-resonant push.
The optimal AC frequency is identified as the upper bifurcation frequency of
the corresponding driven nonlinear oscillator. Together with fast switching
times it makes the perpendicular AC method to be the most efficient way to
realize spin-torque memory valve.Comment: 8 pages, 11 figure
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Learning From Coalitions' Efforts to Promote Equity and Justice.
Coalitions and collaboratives are working to address many of the most pressing contemporary health and social issues. The articles in this special issue provide numerous insights into these complex collaborative processes across different contexts and focal issues. All emphasize and scrutinize the strategies that groups are using in their work. These strategies seek to navigate not only conventional notions of effectiveness but also the challenges of pursuing greater equity and justice. In this concluding article, we distill some of the key insights from these articles as a collective. This special issue on collaborating for equity and justice can serve as a launching point for new efforts by coalitions and researchers pursuing policy, systems, and structural changes, particularly those intent on addressing root causes of health and social disparities
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Spoken word recognition in adolescents with autism spectrum disorders and specific language impairment
Spoken word recognition, during gating, appears intact in specific language impairment (SLI). This study used gating to investigate the process in adolescents with autism spectrum disorders plus language impairment (ALI). Adolescents with ALI, SLI, and typical language development (TLD), matched on nonverbal IQ listened to gated words that varied in frequency (low/high) and number of phonological onset neighbors (low/high density). Adolescents with ALI required more speech input to initially identify low-frequency words with low competitor density than those with SLI and those with TLD, who did not differ. These differences may be due to less well specified word form representations in ALI
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