Macrospin and micromagnetic studies of tilted polarizer spin-torque nano-oscillators
2012 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 112, no 6, 063903- p.Article in journal (Refereed) Published
Using nonlinear dynamical systems theory, we analytically studied a spin-torque device in which the magnetization of the polarizer (the fixed layer) is tilted at an arbitrary angle out of the thin-film plane. While the analytical theory can determine the major features of the system, macrospin simulations were employed to demonstrate the unique characteristics of the system, such as the hysteretic switching between bistable states. Material dependencies of the dynamic and static state diagrams were also studied in the framework of the macrospin model. Full-scale micromagnetics simulations were finally performed to reveal more subtle features of the dynamics of such tilted polarizer systems. Both the macrospin and micromagnetics simulations gave quantitatively the same results as our analytical theory.
Place, publisher, year, edition, pages
2012. Vol. 112, no 6, 063903- p.
Angular-Dependence, Wave Excitations, Driven, Field, Modulation, Simulation, Emission, Devices
IdentifiersURN: urn:nbn:se:kth:diva-104704DOI: 10.1063/1.4752265ISI: 000309423200075ScopusID: 2-s2.0-84867063303OAI: oai:DiVA.org:kth-104704DiVA: diva2:567255
FunderSwedish Research CouncilKnut and Alice Wallenberg Foundation
QC 201211122012-11-122012-11-092012-11-12Bibliographically approved