Magnetic phase transition and spin-reorientation transition ofCu∕Ni∕Fe∕Cu(001)studied by photoemission electron microscopy

2004 ◽  
Vol 70 (2) ◽  
Author(s):  
H. W. Zhao ◽  
C. Won ◽  
Y. Z. Wu ◽  
A. Scholl ◽  
A. Doran ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Spin Reorientation ◽  
Photoemission Electron Microscopy ◽  
Spin Reorientation Transition ◽  
Photoemission Electron

scholarly journals Driving the polar spin reorientation transition of ultrathin ferromagnets with antiferromagnetic–ferromagnetic phase transition of nearby FeRh alloy film

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
P. Dróżdż ◽  
M. Ślęzak ◽  
W. Janus ◽  
M. Szpytma ◽  
H. Nayyef ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Ferromagnetic Layer ◽  
Magnetic Coupling ◽  
Alloy Film ◽  
Spin Reorientation ◽  
Ferromagnetic Phase ◽  
Ferromagnetic Phase Transition ◽  
The Impact

Abstract We show that in-plane to out-of-plane magnetization switching of a ferromagnetic layer can be driven by antiferromagnetic–ferromagnetic phase transition in a nearby FeRh system. For FeRh/Au/FeAu trilayers, the impact of the magnetic phase transition of FeRh onto the perpendicular magnetization of monoatomic FeAu superlattices is transferred across the Au spacer layer via interlayer magnetic coupling. The polar spin reorientation process of the FeAu spins driven by the magnetic phase transition in the FeRh reveals its major features; namely it is reversible and displays hysteresis.

scholarly journals Spin-reorientation magnetic transitions in Mn-doped SmFeO3

IUCrJ ◽  
2017 ◽  
Vol 4 (5) ◽  
pp. 598-603 ◽  
Author(s):  
Jian Kang ◽  
Yali Yang ◽  
Xiaolong Qian ◽  
Kai Xu ◽  
Xiaopeng Cui ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Magnetization Vector ◽  
Spin Reorientation ◽  
Antiferromagnetic Order ◽  
Spin Configuration ◽  
Crystallographic Axes ◽  
Mn Doped

Spin reorientation is a magnetic phase transition in which rotation of the magnetization vector with respect to the crystallographic axes occurs upon a change in the temperature or magnetic field. For example, SmFeO3shows a magnetization rotation from thecaxis above 480 K to theaaxis below 450 K, known as the Γ4→ Γ2transition. This work reports the successful synthesis of the new single-crystal perovskite SmFe0.75Mn0.25O3and finds interesting spin reorientations above and below room temperature. In addition to the spin reorientation of the Γ4→ Γ2magnetic phase transition observed at aroundTSR2= 382 K, a new spin reorientation, Γ2→ Γ1, was seen at aroundTSR1= 212 K due to Mn doping, which could not be observed in the parent rare earth perovskite compound. This unexpected spin configuration has complete antiferromagnetic order without any canting-induced weak ferromagnetic moment, resulting in zero magnetization in the low-temperature regime.M–TandM–Hmeasurements have been made to study the temperature and magnetic-field dependence of the observed spin reorientation transitions.

scholarly journals High-throughput analysis of magnetic phase transition by combining table-top sputtering, photoemission electron microscopy, and Landau theory

2021 ◽  
Author(s):  
Masato Kotsugi ◽  
Tadashi Nishio ◽  
Masahiro Yamamoto ◽  
Takuo Ohkochi ◽  
Daigo Nanasawa ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Throughput ◽  
Magnetic Phase ◽  
Magnetic Circular Dichroism ◽  
Landau Theory ◽  
Parameter Analysis ◽  
Composition Gradient ◽  
Photoemission Electron Microscopy ◽  
Experimental Apparatus ◽  
Photoemission Electron

Abstract Recent progress in materials informatics has triggered growing interest in combinatorial experimental systems for materials development. We demonstrate a novel high-throughput experiment combining compact materials synthesis, synchrotron radiation measurements, and statistical data analysis. This technique focuses on not only drawing phase diagrams but also analysing phase transitions for exploring the functions of magnetic materials. This study involved the rapid preparation of a composition-gradient Fe–Co–Cr ternary thin film using a table-top sputtering system and 3D printer, followed by measurement of the chemical components and magnetic contrast by photoemission electron microscopy, through the acquisition of one million spectral datasets within 10 min. The ternary magnetic phase diagram of Fe–Co–Cr obtained by statistical analysis of the magnetic circular dichroism (MCD) contrast images was in perfect agreement with previous studies. The MCD histogram was fitted based on Landau theory, and the estimated critical exponent β (0.36 ± 0.028) showed excellent agreement with previous theoretical and experimental studies. This study successfully demonstrates universal physical parameter analysis that characterizes magnetic properties by a high-throughput approach combined with a simple experimental apparatus.

Resolution in photoelectron microscopy

1991 ◽  
Vol 49 ◽  
pp. 458-459
Author(s):  
G. F. Rempfer
Keyword(s):  
Electron Microscopy ◽  
Electric Field ◽  
Ultraviolet Light ◽  
Uniform Field ◽  
Virtual Image ◽  
Lens System ◽  
Photoemission Electron Microscopy ◽  
Planar Electrode ◽  
Electron Lens ◽  
Photoemission Electron

In photoelectron microscopy (PEM), also called photoemission electron microscopy (PEEM), the image is formed by electrons which have been liberated from the specimen by ultraviolet light. The electrons are accelerated by an electric field before being imaged by an electron lens system. The specimen is supported on a planar electrode (or the electrode itself may be the specimen), and the accelerating field is applied between the specimen, which serves as the cathode, and an anode. The accelerating field is essentially uniform except for microfields near the surface of the specimen and a diverging field near the anode aperture. The uniform field forms a virtual image of the specimen (virtual specimen) at unit lateral magnification, approximately twice as far from the anode as is the specimen. The diverging field at the anode aperture in turn forms a virtual image of the virtual specimen at magnification 2/3, at a distance from the anode of 4/3 the specimen distance. This demagnified virtual image is the object for the objective stage of the lens system.

scholarly journals Study of physical properties of a ferrimagnetic spinel Cu1.5Mn1.5O4: spin dynamics, magnetocaloric effect and critical behavior

RSC Advances ◽  
2021 ◽  
Vol 11 (41) ◽  
pp. 25664-25676
Author(s):  
Abir Hadded ◽  
Jalel Massoudi ◽  
Sirine Gharbi ◽  
Essebti Dhahri ◽  
A. Tozri ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Physical Properties ◽  
Magnetocaloric Effect ◽  
Phase Transition Temperature ◽  
Magnetic Phase Transition ◽  
Critical Behavior ◽  
Magnetic Phase ◽  
Spin Dynamics ◽  
Critical Behaviour

The present work reports a detailed study of the spin dynamics, magnetocaloric effect and critical behaviour near the magnetic phase transition temperature, of a ferrimagnetic spinel Cu1.5Mn1.5O4.

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