Magnetic forces controlling magnetic shape memory in Ni-Mn-Ga and their practical measurement from the mechanical testing experiments in constant magnetic fields

2004 ◽  
Author(s):  
Alexander A. Likhachev ◽  
Alexei Sozinov ◽  
Kari Ullakko
Keyword(s):  
Magnetic Fields ◽  
Shape Memory ◽  
Mechanical Testing ◽  
Magnetic Shape Memory ◽  
Magnetic Forces ◽  
Practical Measurement

scholarly journals Two types of magnetic shape-memory effects from twinned microstructure and magneto-structural coupling in Fe1+yTe

2019 ◽  
Vol 116 (34) ◽  
pp. 16697-16702 ◽  
Author(s):  
Sahana Rößler ◽  
Cevriye Koz ◽  
Zhaosheng Wang ◽  
Yurii Skourski ◽  
Mathias Doerr ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Shape Memory ◽  
Isothermal Transformation ◽  
Transformation Process ◽  
Scanning Tunneling ◽  
Magnetic Shape Memory ◽  
Tunneling Microscopy ◽  
Large Hysteresis ◽  
Shape Memory Effects ◽  
Lattice State

A detailed experimental investigation of Fe1+yTe (y = 0.11, 0.12) using pulsed magnetic fields up to 60 T confirms remarkable magnetic shape-memory (MSM) effects. These effects result from magnetoelastic transformation processes in the low-temperature antiferromagnetic state of these materials. The observation of modulated and finely twinned microstructure at the nanoscale through scanning tunneling microscopy establishes a behavior similar to that of thermoelastic martensite. We identified the observed, elegant hierarchical twinning pattern of monoclinic crystallographic domains as an ideal realization of crossing twin bands. The antiferromagnetism of the monoclinic ground state allows for a magnetic-field–induced reorientation of these twin variants by the motion of one type of twin boundaries. At sufficiently high magnetic fields, we observed a second isothermal transformation process with large hysteresis for different directions of applied field. This gives rise to a second MSM effect caused by a phase transition back to the field-polarized tetragonal lattice state.

scholarly journals Structural and Magnetic Properties of Magnetic Shape Memory Alloy Ni46Mn41In13 under Magnetic Fields

2014 ◽  
Vol 55 (3) ◽  
pp. 477-481 ◽  
Author(s):  
Kenichi Abematsu ◽  
Rie Y. Umetsu ◽  
Ryosuke Kainuma ◽  
Takeshi Kanomata ◽  
Kazuo Watanabe ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Fields ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Magnetic Shape Memory ◽  
Magnetic Shape Memory Alloy ◽  
Structural And Magnetic Properties
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