Journal
PHYSICAL REVIEW B
Volume 73, Issue 24, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.73.241307
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We investigate the noncollinear exchange coupling across a trilayer magnetic junction composed of an intermediate layer with Rashba interaction and two sandwiching ferromagnetic layers. To compute the mediated exchange coupling, one needs to go beyond the single-particle argument and integrate over the contributions from the whole Fermi surface. Surprisingly, we find that the topology of the Fermi surface plays a crucial role in determining whether the oscillatory Ruderman-Kittel-Kasuya-Yosida or the spiral interactions will dominate. At the end, we discuss the connection of our numerical results to experiments and potential applications.
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