Ferromagnetic State of LaMnO3 Interlayer in La0.7Sr0.3MnO3/LaMnO3/SrRuO3 Heterostructures

2015 ◽  
Vol 233-234 ◽  
pp. 439-442
Author(s):  
Andrey M. Petrzhik ◽  
Yury N. Khaydukov ◽  
Luqman Mustafa ◽  
Victor V. Demidov ◽  
Gennady A. Ovsyannikov
Keyword(s):  
Ferromagnetic Resonance ◽  
Magnetic Moment ◽  
Magnetic State ◽  
Ferromagnetic State ◽  
Data Fitting ◽  
Squid Magnetometer ◽  
Neutron Reflectometry ◽  
Total Magnetization ◽  
Epitaxial Heterostructures ◽  
Polarized Neutron Reflectometry

Magnetic state of epitaxial heterostructures La0.7Sr0.3MnO3/LaMnO3/SrRuO3 (LSMO/LMO/SRO) was studied by SQUID magnetometer, ferromagnetic resonance (FMR) and polarized neutron reflectometry (PNR) techniques. The fit of PNR and FMR data give us the magnetization of each layer, while the SQUID gives the total magnetization of our structures. The magnetic moment of the LMO layer has the magnetization 4πMLMO=4.2kGs (2.4 mB/Mn) at T=140K according to our PNR data fitting.

A Neutron Reflectivity Study of the Interfacial Magnetism of an Y/Gd Film

1989 ◽  
Vol 166 ◽  
Author(s):  
J.F. Ankner ◽  
H. Zabel ◽  
D.A. Neumann ◽  
C.F. Majkrzak ◽  
A. Matheny ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Magnetic Moment ◽  
Basal Plane ◽  
Epitaxial Film ◽  
Neutron Reflectometry ◽  
Interfacial Region ◽  
Neutron Reflectivity ◽  
Moment Distribution ◽  
Polarized Neutron ◽  
Polarized Neutron Reflectometry

ABSTRACTUsing the technique of polarized-neutron reflectometry, we have studied the magnetic moment distribution in the interfacial region of an epitaxial film consisting of 97 Å Y(0001) atop 1000 Å Gd(0001). At T = 151 K, with an 80 gauss field applied parallel to the surface (basal plane), we observe two distinct ferromagnetic regions: the Gd bulk and a layer with reduced magnetic moment at the Y/Gd interface. Above the bulk Curie temperature, at T = 295 K , we observe no net magnetization in either the bulk or the interface.

(Anti-)ferromagnetic coupling in Fe/Si multilayers from polarized neutron reflectometry

1997 ◽  
Vol 234-236 ◽  
pp. 498-499
Author(s):  
H. Fredrikze ◽  
A. van der Graaf ◽  
M. Valkier ◽  
J. Kohlhepp ◽  
F.J.A. den Broeder
Keyword(s):  
Neutron Reflectometry ◽  
Ferromagnetic Coupling ◽  
Polarized Neutron ◽  
Polarized Neutron Reflectometry

Measurements of magnetic screening lengths in superconducting Nb thin films by polarized neutron reflectometry

1995 ◽  
Vol 52 (14) ◽  
pp. 10395-10404 ◽  
Author(s):  
Huai Zhang ◽  
J. W. Lynn ◽  
C. F. Majkrzak ◽  
S. K. Satija ◽  
J. H. Kang ◽  
...  
Keyword(s):  
Thin Films ◽  
Neutron Reflectometry ◽  
Magnetic Screening ◽  
Polarized Neutron ◽  
Polarized Neutron Reflectometry

scholarly journals The impact of number of repeats N on the interlayer exchange in $$[\text {Fe/MgO}]_{N} $$(001) superlattices

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tobias Warnatz ◽  
Fridrik Magnus ◽  
Nanny Strandqvist ◽  
Sarah Sanz ◽  
Hasan Ali ◽  
...  
Keyword(s):  
Quantum Well ◽  
Exchange Coupling ◽  
Neutron Reflectometry ◽  
Interlayer Exchange Coupling ◽  
Magnetic Switching ◽  
Interlayer Exchange ◽  
Quantum Well States ◽  
The Impact ◽  
Polarized Neutron Reflectometry ◽  
Mgo Layers

AbstractThe strength of the interlayer exchange coupling in [Fe/MgO]$$_N$$ N (001) superlattices with 2 ≤ N ≤ 10 depends on the number of bilayer repeats (N). The exchange coupling is antiferromagnetic for all the investigated thicknesses while being nine times larger in a sample with N = 4 as compared to N = 2. The sequence of the magnetic switching in two of the samples (N = 4, N = 8) is determined using polarized neutron reflectometry. The outermost layers are shown to respond at the lowest fields, consistent with having the weakest interlayer exchange coupling. The results are consistent with the existence of quantum well states defined by the thickness of the Fe and the MgO layers as well as the number of repeats (N) in [Fe/MgO]$$ _{N}$$ N (001)superlattices.

Orbital angular momentum-driven anomalous Hall effect

2021 ◽  
Author(s):  
Oliver Dowinton ◽  
Mohammad Bahramy
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Transition Metal Oxides ◽  
Magnetic State ◽  
Magnetic Moments ◽  
Anomalous Hall Effect ◽  
Ferromagnetic State ◽  
Periodic Systems ◽  
Spin States ◽  
Berry Curvature

Abstract Orbital angular momentum (OAM) plays a central role in regulating the magnetic state of electrons in non-periodic systems such as atoms and molecules. In solids, on the other hand, OAM is usually quenched by the crystal field, and thus, has a negligible effect on magnetisation. Accordingly, it is generally neglected in discussions around band topology such as Berry curvature (BC) and intrinsic anomalous Hall conductivity (AHC). Here, we present a theoretical framework demonstrating that crystalline OAM can be directionally unquenched in transition metal oxides via energetic proximity of the conducting d electrons to the local magnetic moments. We show that this leads to `composite' Fermi-pockets with topologically non-trivial OAM textures. This enables a giant Berry curvature with an intrinsic non-monotonic AHC, even in collinearly-ordered spin states. We use this model to explain the origin of the giant AHC observed in the forced-ferromagnetic state of EuTiO3 and propose it as a prototype for OAM driven AHC.

Study of the [(Co45Fe45Zr10)x(Al2O3)100−x/a-Si:H]m multilayer nanostructure by polarized neutron reflectometry

2011 ◽  
Vol 406 (12) ◽  
pp. 2397-2400 ◽  
Author(s):  
E.A. Dyadkina ◽  
S.V. Grigoriev ◽  
D. Lott ◽  
A.V. Sitnikov ◽  
Y.E. Kalinin
Keyword(s):  
Neutron Reflectometry ◽  
Polarized Neutron ◽  
Polarized Neutron Reflectometry

The Effect Of Isovalent Substitution In The Rare-Earth Subsystem On Ground Magnetic State Of A Single Crystal La1.4sr1.6mn2o7

2015 ◽  
Vol 10 (4) ◽  
pp. 95-99
Author(s):  
Nikolay Pavlovskii ◽  
Kirill Shaykhutdinov ◽  
Andrey Dubrovskiy ◽  
Mikhail Petrov ◽  
Konstantin Terent’ev ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Ground State ◽  
Sharp Increase ◽  
Magnetic State ◽  
Ferromagnetic State ◽  
Metamagnetic Transition ◽  
Isovalent Substitution ◽  
Ground Magnetic ◽  
Orbital Character

In this report we investigate changing of magnetic properties of system (La1-zNdz)1.4Sr1.6Mn2O7 during isovalent substitution from lanthanium to neodymium at different concentration z = 0, 0.3. Decreasing of Mn-Mn in-plane distance with increasing z leads to the suppression of the ferromagnetic state that, as expected, tells us about the change of the orbital character eg – electrons with 2 2 3z r d  on the 2 2 . x y d  Also, at high applied magnetic fields metamagnetic transition observed at concentration z = 0.3, it is characterized by a sharp increase of the magnetization and the change of the ground state of the sample from the antiferromagnetic to ferromagnetic.

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