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Significant new functionality is reported for torsion mechanical tools aimedat full magnetic characterizations of both spin statics and dynamics in micro-and nanostructures. Specifically, two orthogonal torque directions aremonitored and the results co-analyzed to separate magnetic moment and magneticsusceptibility contributions to torque, as is desired for characterization ofanisotropic three-dimensional structures. The approach is demonstrated throughapplication to shape and microstructural disorder-induced magnetic anisotropiesin lithographically patterned permalloy, and will have utility for thedetermination of important magnetic thin-film and multilayer propertiesincluding interface anisotropy and exchange bias. The results reflectremarkable sensitivity of the out-of-plane magnetic torque to the nature ofsmall edge domains perpendicular to the applied field direction, and alsocontain tantalizing indications of direct coupling to spin dynamics at thefrequency of the mechanics.

Two-axis cavity optomechanical torque characterization of magnetic microstructures