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Spin Dynamics in Patterned Magnetic Structures

Event Details

Event Dates: 

Thursday, March 13, 2014 - 12:00pm

Seminar Location: 

  • JILA X317

Speaker Name(s): 

Kristen Buchanan

Speaker Affiliation(s): 

Seminar Type/Subject

Scientific Seminar Type: 

  • Condensed Matter Seminar

Event Details & Abstract: 

Dynamic processes in magnetic materials are important from a fundamental and applied perspective alike. Dynamic processes can be used to measure important material properties, offer opportunities for the development of new  evices based on spin waves, and, furthermore, can be used as a means to probe the nature of spin transfer torque effects. This talk will touch on each of these areas. I will discuss measurements of thermal spin waves using Brillouin light scattering (BLS) that were used to determine the magnetic exchange constant for soft FeCo films of high magnetization, materials that are an integral part of today‚Äôs magnetic recording heads. On smaller length scales, BLS microscopy provides new opportunities to map out and understand both propagating and standing spin wave excitations in nano-patterned magnetic films. Confinement in nanomagnets alters their energetics, and consequently affects the dynamic properties of the system.  Furthermore, at low magnetic fields it leads to new magnetic states, for example, magnetic vortices and antivortices that, in turn, exhibit unique dynamic properties.  Finally, I will show how the dynamics of a magnetic vortex in a patterned magnetic thin film can be used to measure the relative contributions of adiabatic and non-adiabatic spin torque effects