Size effects on magnetic actuation in Ni‐Mn‐Ga shape‐memory alloys

DC Dunand, P Müllner - Advanced Materials, 2011‏ - Wiley Online Library
Abstract The off‐stoichiometric Ni2MnGa Heusler alloy is a magnetic shape‐memory alloy
capable of reversible magnetic‐field‐induced strains (MFIS). These are generated by twin …

Magnetocaloric materials: From micro-to nanoscale

JH Belo, AL Pires, JP Araujo… - Journal of Materials …, 2019‏ - cambridge.org
Twenty one years ago, the discovery of the giant magnetocaloric effect (GMCE) at room
temperature completely revolutionized the magnetocaloric materials field demonstrating the …

Adaptive modulations of martensites

S Kaufmann, UK Rößler, O Heczko, M Wuttig… - Physical Review Letters, 2010‏ - APS
Modulated phases occur in numerous functional materials like giant ferroelectrics and
magnetic shape-memory alloys. To understand the origin of these phases, we employ and …

Modulated martensite: why it forms and why it deforms easily

S Kaufmann, R Niemann, T Thersleff… - New Journal of …, 2011‏ - iopscience.iop.org
Diffusionless phase transitions are at the core of the multifunctionality of (magnetic) shape
memory alloys, ferroelectrics and multiferroics. Giant strain effects under external fields are …

Nanoscale Skyrmions in a Nonchiral Metallic Multiferroic: Ni2MnGa

C Phatak, O Heinonen, M De Graef, A Petford-Long - Nano letters, 2016‏ - ACS Publications
Magnetic skyrmions belong to a set of topologically nontrivial spin textures at the nanoscale
that have received increased attention due to their emergent behavior and novel potential …

Building hierarchical martensite

S Schwabe, R Niemann, A Backen… - Advanced Functional …, 2021‏ - Wiley Online Library
Martensitic materials show a complex, hierarchical microstructure containing structural
domains separated by various types of twin boundaries. Several concepts exist to describe …

[HTML][HTML] Magnetic shape memory microactuators

M Kohl, M Gueltig, V Pinneker, R Yin, F Wendler… - Micromachines, 2014‏ - mdpi.com
By introducing smart materials in micro systems technologies, novel smart microactuators
and sensors are currently being developed, eg, for mobile, wearable, and implantable …

Electronic behaviors during martensitic transformations in all-d-metal Heusler alloys

Q Zeng, J Shen, H Zhang, J Chen, B Ding… - Journal of Physics …, 2019‏ - iopscience.iop.org
For solid-state phase transitions, the alterations of electronic structure driven by the band
Jahn–Teller effect would play an essential role in the structural phase transitions and in …

Magnetic shape memory effect and highly mobile twin boundaries

O Heczko - Materials Science and Technology, 2014‏ - journals.sagepub.com
The magnetic shape memory effect can be classified as an example of the multiferroic effect
combining ferro-elasticity and (ferro) magnetism. After short overview of all known effects the …

[HTML][HTML] Small-scale functional fatigue of a Ni-Mn-Ga Heusler alloy

A Fareed, JM Rosalie, S Kar, S Fähler, R Maaß - Acta Materialia, 2024‏ - Elsevier
Functional fatigue of shape-memory alloys is a considerable threat to the reliable service of
actuation devices. Here, we demonstrate the essentially degradation-free cyclic phase …