skip to main content

Title: Ni-Mn-Ga shape memory nanoactuation

To probe finite size effects in ferromagnetic shape memory nanoactuators, double-beam structures with minimum dimensions down to 100 nm are designed, fabricated, and characterized in-situ in a scanning electron microscope with respect to their coupled thermo-elastic and electro-thermal properties. Electrical resistance and mechanical beam bending tests demonstrate a reversible thermal shape memory effect down to 100 nm. Electro-thermal actuation involves large temperature gradients along the nanobeam in the order of 100 K/μm. We discuss the influence of surface and twin boundary energies and explain why free-standing nanoactuators behave differently compared to constrained geometries like films and nanocrystalline shape memory alloys.
Authors:
; ;  [1] ; ;  [2] ;  [2] ;  [3]
  1. Karlsruhe Institute of Technology, IMT, P.O. Box 3640, 76021 Karlsruhe (Germany)
  2. IFW Dresden, P.O. Box 270116, 01171 Dresden (Germany)
  3. (Germany)
Publication Date:
OSTI Identifier:
22280522
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; BENDING; COMPARATIVE EVALUATIONS; CRYSTALS; ELECTRIC CONDUCTIVITY; GALLIUM ALLOYS; MANGANESE ALLOYS; NANOSTRUCTURES; NICKEL ALLOYS; SCANNING ELECTRON MICROSCOPY; SHAPE MEMORY EFFECT; SURFACES; TEMPERATURE GRADIENTS; THERMODYNAMIC PROPERTIES; THIN FILMS