scholarly journals Detecting quadrupole: a hidden source of magnetic anisotropy for Manganese alloys

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jun Okabayashi ◽  
Yoshio Miura ◽  
Yohei Kota ◽  
Kazuya Z. Suzuki ◽  
Akimasa Sakuma ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Quantum Physics ◽  
Theoretical Calculations ◽  
Magnetic Moments ◽  
Perpendicular Magnetic Anisotropy ◽  
Linear Dichroism ◽  
First Principles Calculation ◽  
X Ray ◽  
Manganese Alloys ◽  
Ordered Alloys

Abstract Mn-based alloys exhibit unique properties in the spintronics materials possessing perpendicular magnetic anisotropy (PMA) beyond the Fe and Co-based alloys. It is desired to figure out the quantum physics of PMA inherent to Mn-based alloys, which have never been reported. Here, the origin of PMA in ferrimagnetic Mn3− δ Ga ordered alloys is investigated to resolve antiparallel-coupled Mn sites using x-ray magnetic circular and linear dichroism (XMCD/XMLD) and a first-principles calculation. We found that the contribution of orbital magnetic moments in PMA is small from XMCD and that the finite quadrupole-like orbital distortion through spin-flipped electron hopping is dominant from XMLD and theoretical calculations. These findings suggest that the spin-flipped orbital quadrupole formations originate from the PMA in Mn3− δ Ga and bring the paradigm shift in the researches of PMA materials using x-ray magnetic spectroscopies.

Magnetic anisotropic properties of Pd/Co/Pd trilayer films studied by X-ray absorption spectroscopy and magnetic circular dichroism

RSC Advances ◽  
2015 ◽  
Vol 5 (25) ◽  
pp. 19014-19019 ◽  
Author(s):  
K. Saravanan ◽  
C.-H. Kao ◽  
Y.-C. Shao ◽  
Y.-F. Wang ◽  
B.-Y. Wang ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Electronic Structures ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
Perpendicular Magnetic Anisotropy ◽  
Effect Of Temperature ◽  
Alloy Formation ◽  
X Ray ◽  
The Relationship ◽  
X Ray Absorption

Strong perpendicular magnetic anisotropy (PMA) is observed in annealed Pd/Co/Pd trilayer film. The effect of temperature on alloy formation, the relationship among the atomic/electronic structures, magnetic moments and PMA has been studied.

Martensite Transition and Microscopic Magnetism of Epitaxial Ni2MnGa Films

2007 ◽  
Vol 1050 ◽  
Author(s):  
Gerhard Jakob ◽  
Tobias Eichhorn ◽  
Michael Kallmayer ◽  
Hans-Joachim Elmers
Keyword(s):  
Magnetic Circular Dichroism ◽  
Theoretical Calculations ◽  
Magnetic Moments ◽  
Structural Phase ◽  
Absorption Feature ◽  
X Ray Diffraction ◽  
Orbital Contribution ◽  
X Ray ◽  
Transmission Geometry ◽  
X Ray Absorption

AbstractA magnetically induced shape memory effect in Ni2MnGa results in huge magnetostrictive effects of several percent. Using x-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD) we investigated element specific magnetic moments and electronic structure of single crystalline, (110) oriented Ni2MnGa films on a-plane Al2O3 substrates in the austenite and martensite state. The structural phase transition of the samples is evident from temperature dependent x-ray diffraction and magnetization measurements. The Ni XAS differ significantly for temperatures above and below the martensite transition in agreement with published ab-initio calculations. Using XAS in transmission geometry on our thin film samples we observe the corresponding reduction of the absorption feature as predicted by theoretical calculations. The XMCD analysis shows the orbital contribution of the Ni electrons to be responsible for the magnetic anisotropy.

Perpendicular magnetic anisotropy of Tb magnetic moments in Tb/Fe multilayers

1997 ◽  
Vol 165 (1-3) ◽  
pp. 408-410
Author(s):  
M. Trhlík ◽  
P. De Moor ◽  
K. Mibu ◽  
N. Severijns ◽  
T. Shinjo ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Moments ◽  
Perpendicular Magnetic Anisotropy

scholarly journals X-ray analysis of oxygen-induced perpendicular magnetic anisotropy in trilayers

2008 ◽  
Vol 320 (13) ◽  
pp. 1889-1892 ◽  
Author(s):  
A. Manchon ◽  
S. Pizzini ◽  
J. Vogel ◽  
V. Uhlíř ◽  
L. Lombard ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
X Ray

Magnetic anisotropy in Ta/CoFeB/MgO investigated by x-ray magnetic circular dichroism and first-principles calculation

2014 ◽  
Vol 105 (22) ◽  
pp. 222409 ◽  
Author(s):  
Shun Kanai ◽  
Masahito Tsujikawa ◽  
Yoshio Miura ◽  
Masafumi Shirai ◽  
Fumihiro Matsukura ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Magnetic Anisotropy ◽  
First Principles ◽  
Magnetic Circular Dichroism ◽  
First Principles Calculation ◽  
X Ray ◽  
Circular Dichroïsm

Perpendicular Magnetic Anisotropy and Atomic Ordering in FePd, Fe50Pd50-xPtx Alloy Films

2014 ◽  
Vol 215 ◽  
pp. 242-245
Author(s):  
Evgeny M. Artemyev ◽  
Lev E. Yakimov
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Phase Composition ◽  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Magnetic Data ◽  
Atomic Order ◽  
Data Recording ◽  
Alloy Films ◽  
Ordered Alloys

Phase composition, crystal structure and magnetic properties of ordering FePd and Fe50Pd50-xPtx(х = 1-10 atomic %) alloy films were studied. Spectral dependencies of Faraday rotation and optical absorption were measured. We studied how thermal treatment affects crystal structure, magnetization and coercive force in ordered alloys and how the degree of atomic order affects the value of perpendicular magnetic anisotropy. It was shown that near equiatomic ordered FePd and Fe50Pd50-xPtx(х = 1-10 at. %) alloy films can be used as medium for magnetic and thermo-magnetic data recording.

Orbital magnetic moments of Co in multilayers with perpendicular magnetic anisotropy

1994 ◽  
Vol 49 (18) ◽  
pp. 12888-12896 ◽  
Author(s):  
D. Weller ◽  
Y. Wu ◽  
J. Stöhr ◽  
M. G. Samant ◽  
B. D. Hermsmeier ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Moments ◽  
Perpendicular Magnetic Anisotropy
Sign in / Sign up

Export Citation Format

Share Document