Magnetic Phase Transition in the Csci Fesi Spacer in Fe/FeSi Multilayers

1995 ◽  
Vol 382 ◽  
Author(s):  
J. Dekoster ◽  
A. Vantomme ◽  
S. Degroote ◽  
R. Moons ◽  
G. Langouche
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Magnetic Phase Transition ◽  
Low Temperatures ◽  
Magnetic Phase ◽  
Ferromagnetic Coupling ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ion Channeling ◽  
Spacer Layer

ABSTRACTWe report the formation of the CsCI FeSi phase in Fe/FeSi multilayers with constant Fe thickness and varying FeSi layer thickness. The crystallographic and magnetic properties of this metastable FeSi phase are determined in thick (62 nm) epitaxial silicide layers with ion channeling, X-ray diffraction and Mossbauer spectroscopy measurements which clearly show that the CsCl phase becomes increasingly magnetic upon cooling down to 4.2 K. These results indicate that the transition from antiferromagnetic to ferromagnetic coupling observed at low temperatures in such multilayers is controlled by a magnetic phase transition in the FeSi spacer layer.

Correlating the local magnetic properties of the magnetic phase transition inGd5Ge4using scanning Hall probe imaging

2006 ◽  
Vol 73 (14) ◽  
Author(s):  
J. D. Moore ◽  
G. K. Perkins ◽  
Y. Bugoslavsky ◽  
L. F. Cohen ◽  
M. K. Chattopadhyay ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Hall Probe

X-Ray Induced Magnetic Phase Transition in CoW Cyanide Probed by XMCD

2007 ◽  
Author(s):  
Hitoshi Osawa ◽  
Naomi Kawamura ◽  
Tomoyuki Matsuda ◽  
Youich Arimoto ◽  
Hitoko Tokoro ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
X Ray

Investigation of the structure and phase transitions of the polymeric inorganic–organic hybrids: [M(Im)4V2O6]∞; M = Mn, Co, Ni, Im = imidazole

2010 ◽  
Vol 67 (1) ◽  
pp. 41-52 ◽  
Author(s):  
Kittipong Chainok ◽  
Kenneth J. Haller ◽  
A. David Rae ◽  
Anthony C. Willis ◽  
Ian D. Williams
Keyword(s):  
Phase Transition ◽  
Low Temperatures ◽  
Stacking Faults ◽  
Local Geometry ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Disordered Phase ◽  
Large Hysteresis ◽  
Close Proximity

The polymeric isomorphous hybrid inorganic–organic vanadium oxide compounds [M(Im)4V2O6]∞, M = Mn, Co, Ni, Im = imidazole, were investigated at various temperatures between 100 and 295 K by single-crystal X-ray diffraction. The crystals all contain two-dimensional polymeric sheets packed perpendicular to c* and are 1:1 disordered in the space group P42/n (Z = 8) at 295 K. The disordered phase is reversibly transformed to an I41/a ordered phase (Z = 32) below 281 K for the Mn compound and below 175 K for the Co compound. Within a localized region of the I41/a phase eight imidazoles are in close proximity and seven of these are hydrogen bonded to framework O atoms. The hydrogen-bond connectivity of six of these ligands is unchanged by the phase transition that allows an inversion of the local geometry using an inversion operator that is a symmetry element of P42/n, but not I41/a. The Mn structure has a well defined phase transition but the Co structure shows a large hysteresis and it was necessary to include stacking faults in the modelling of the Co structure at low temperatures. The Ni structure was shown to be partially twinned, but ordered in the space group P2/n (Z = 8) at 100 K, with two different localized regions each containing four pairs of inversion-related imidazoles, hydrogen bonding to framework O atoms involving eight imidazoles in one region and six imidazoles in the other. Models for the phase transition mechanisms are considered.

Al Effect on the Structure of the Spray Formed Fe88Si12 (at%) Alloy

2008 ◽  
Vol 570 ◽  
pp. 150-154 ◽  
Author(s):  
F. Saporiti ◽  
A.H. Kasama ◽  
B. Arcondo ◽  
Walter José Botta Filho ◽  
Claudio Shyinti Kiminami ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Low Temperatures ◽  
Spray Forming ◽  
Order Reaction ◽  
Soft Magnetic Properties ◽  
Thin Sheets ◽  
X Ray Diffraction ◽  
Soft Magnetic ◽  
Silicon Alloys ◽  
X Ray

Fe-Si alloys have excellent soft magnetic properties, specially around 12 at% Si. However, its industrial application is limited because of the lack of ductility, which causes cracking during rolling operations for the fabrication of thin sheets. The reason of the brittleness of the high silicon alloys is a disorder/order reaction at low temperatures. The aim of this work is to analyze the effect of the addition of Aluminum on the crystalline structure of Fe-Si alloys. Samples with a chemical composition of Fe88Si12 and Fe87Si12Al1 (at%) were prepared by Spray Forming. The structure was studied by means of X-ray diffraction and Mössbauer Spectroscopy. The presence of the DO3 and α- Fe phases were observed

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