X-ray Diffraction Study of Order–Disorder Phase Transition in CuMPt6 (M=3d Elements) Alloys

2009 ◽  
Vol 78 (1) ◽  
pp. 014601 ◽  
Author(s):  
Ejaz Ahmed ◽  
Miwako Takahashi ◽  
Hiroshi Iwasaki ◽  
Ken-ichi Ohshima
Keyword(s):  
Phase Transition ◽  
Diffraction Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Disorder Phase Transition ◽  
3D Elements

High-energy X-ray diffraction study on phase transition asymmetry of plastic crystal neopentylglycol

2021 ◽  
Author(s):  
Zhe Zhang ◽  
Yanna Chen ◽  
Ji Qi ◽  
Zhao Zhang ◽  
Koji Ohara ◽  
...  
Keyword(s):  
Phase Transition ◽  
Diffraction Study ◽  
High Energy ◽  
Plastic Crystal ◽  
X Ray Diffraction ◽  
X Ray

X-Ray Diffraction Study of Ordered Antiferromagnets for Tunnel Junctions

2006 ◽  
Vol 514-516 ◽  
pp. 314-318
Author(s):  
Nuno Franco ◽  
Eduardo Alves ◽  
M. Rickart ◽  
Anibal Guedes ◽  
Paulo Freitas ◽  
...  
Keyword(s):  
Phase Transition ◽  
Diffraction Study ◽  
Exchange Coupling ◽  
Tunnel Junctions ◽  
Blocking Temperature ◽  
X Ray Diffraction ◽  
Insulating Layer ◽  
X Ray ◽  
Fcc Phase ◽  
20 Nm

Antiferromagnets (AF) such as MnPt and MnNi can be used in spin valves and tunnel junctions due to their high exchange coupling, high blocking temperature, and fair corrosion resistance. They are used as pinning layer in a AF/FM/barrier/FM structure, where FM is a ferromagnet such as CoFe and the barrier is an ultra-thin insulating layer. However, as deposited MnPt and MnNi films with thickness around 20 nm are in the fcc phase, and show no exchange bias in AF/FM bilayers. A transition from fcc to fct is required, and takes place upon annealing. We present an X-ray diffraction study of the phase transition in glass/Ta 7nm/Ru 3 nm/MnPt 20 nm/CoFe 5 nm/Ta 3 nm AF/FM bilayers. We observe the MnPt phase transition from fcc to fct around 250°C. We correlate the phase transition with the change of the bilayers magnetic properties.

Sign in / Sign up

Export Citation Format

Share Document