Till sidans topp

Sidansvarig: Webbredaktion
Sidan uppdaterades: 2012-09-11 15:12

Tipsa en vän
Utskriftsversion

Mode-coupling mechanisms … - Göteborgs universitet Till startsida
Webbkarta
Till innehåll Läs mer om hur kakor används på gu.se

Mode-coupling mechanisms in nanocontact spin-torque oscillators

Artikel i vetenskaplig tidskrift
Författare Ezio Iacocca
Philipp Dürrenfeld
O. Heinonen
Johan Åkerman
Randy K. Dumas
Publicerad i Physical Review B
Volym 91
Nummer/häfte 10
Sidor artikel 104405
ISSN 1098-0121
Publiceringsår 2015
Publicerad vid Institutionen för fysik (GU)
Sidor artikel 104405
Språk en
Länkar dx.doi.org/10.1103/PhysRevB.91.1044...
Ämnesord NANO-OSCILLATORS, BUILDING-BLOCKS, DRIVEN, WAVES, Physics, Condensed Matter
Ämneskategorier Fysik

Sammanfattning

Spin-torque oscillators (STOs) are devices that allow for the excitation of a variety of magnetodynamical modes at the nanoscale. Depending on both external conditions and intrinsic magnetic properties, STOs can exhibit regimes of mode hopping and even mode coexistence. Whereas mode hopping has been extensively studied in STOs patterned as nanopillars, coexistence has been only recently observed for localized modes in nanocontact STOs (NC-STOs), where the current is confined to flow through a NC fabricated on an extended pseudo spin valve. By means of electrical characterization and a multimode STO theory, we investigate the physical origin of the mode-couplingmechanisms favoring coexistence. Two couplingmechanisms are identified: (i) magnon-mediated scattering and (ii) intermode interactions. These mechanisms can be physically disentangled by fabricating devices where the NCs have an elliptical cross section. The generation power and linewidth from such devices are found to be in good qualitative agreement with the theoretical predictions, as well as provide evidence of the dominant mode-coupling mechanisms.

Sidansvarig: Webbredaktion|Sidan uppdaterades: 2012-09-11
Dela:

På Göteborgs universitet använder vi kakor (cookies) för att webbplatsen ska fungera på ett bra sätt för dig. Genom att surfa vidare godkänner du att vi använder kakor.  Vad är kakor?