scholarly journals Resonant nanodiffraction x-ray imaging reveals role of magnetic domains in complex oxide spin caloritronics

2020 ◽  
Vol 6 (40) ◽  
pp. eaba9351
Author(s):  
Paul G. Evans ◽  
Samuel D. Marks ◽  
Stephan Geprägs ◽  
Maxim Dietlein ◽  
Yves Joly ◽  
...  
Keyword(s):  
Magnetic Domain ◽  
Complex Oxide ◽  
Resonant Scattering ◽  
Magnetic Domains ◽  
Substantial Impact ◽  
Magnetic Microstructure ◽  
X Ray ◽  
Energy Domain ◽  
Buried Layers ◽  
Spin Electronic

Spin electronic devices based on crystalline oxide layers with nanoscale thicknesses involve complex structural and magnetic phenomena, including magnetic domains and the coupling of the magnetism to elastic and plastic crystallographic distortion. The magnetism of buried nanoscale layers has a substantial impact on spincaloritronic devices incorporating garnets and other oxides exhibiting the spin Seebeck effect (SSE). Synchrotron hard x-ray nanobeam diffraction techniques combine structural, elemental, and magnetic sensitivity and allow the magnetic domain configuration and structural distortion to be probed in buried layers simultaneously. Resonant scattering at the Gd L2 edge of Gd3Fe5O12 layers yields magnetic contrast with both linear and circular incident x-ray polarization. Domain patterns facet to form low-energy domain wall orientations but also are coupled to elastic features linked to epitaxial growth. Nanobeam magnetic diffraction images reveal diverse magnetic microstructure within emerging SSE materials and a strong coupling of the magnetism to crystallographic distortion.

scholarly journals Heat Treatment Effect on Magnetic Microstructure of Fe73.9Cu1Nb3Si13.2B8.9 Thin Films

2018 ◽  
Vol 185 ◽  
pp. 04001
Author(s):  
Evgeniya Mikhalitsyna ◽  
Ivan Zakharchuk ◽  
Ekaterina Soboleva ◽  
Pavel Geydt ◽  
Vasiliy Kataev ◽  
...  
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Amorphous State ◽  
Magnetic Domain ◽  
Domain Size ◽  
Magnetic Domains ◽  
Magnetic Microstructure ◽  
Glass Substrates ◽  
Radio Frequency Sputtering ◽  
Anisotropy Model

Fe73.9Cu1Nb3Si13.2B8.9 (Finemet) thin films were deposited on the glass substrates by means of radio frequency sputtering. The films thickness was varied from 10 to 200 nm. Heat treatment at temperatures of 350, 400 and 450 °C were performed for 30 minutes in order to control thin film structural state. The X-ray powder diffractometry revealed that the crystallization of α-FeSi nanograins took place only at 450 °C whilst the other samples stayed in the amorphous state. Relation between the structure and magnetic properties of the films was discussed in the framework of random magnetic anisotropy model and the concept of stochastic magnetic domains. The latter was investigated using magnetic force microscopy (MFM). MFM data showed formation of such magnetic domains only in samples thermally treated at 450 °C. There was a tendency of the magnetic domain size reduction with the thickness decrease.

Correlation between the magnetic-microstructure and microwave mitigation ability of MxCo(1−x)Fe2O4 based ferrite–carbon black/PVA composites

2018 ◽  
Vol 20 (41) ◽  
pp. 26431-26442 ◽  
Author(s):  
Gopal Datt ◽  
Chetan Kotabage ◽  
Suwarna Datar ◽  
Ashutosh C. Abhyankar
Keyword(s):  
Carbon Black ◽  
Domain Structure ◽  
Crucial Role ◽  
Magnetic Domain ◽  
Magnetic Domain Structure ◽  
Magnetic Losses ◽  
Magnetic Domains ◽  
Magnetic Microstructure

This work reports on the correlation between the magnetic-domain structure and microwave mitigation properties of ferrite–Carbon black/PVA Composites. Distorted co-ordination of Fe3+ along with unique single axis oriented magnetic domains plays a crucial role in magnetic losses and hence, in mitigation of microwaves.

Influence of Annealing Temperature on Microstructure and Magnetic Properties of Ti/Ni/Ti Thin Films

2011 ◽  
Vol 239-242 ◽  
pp. 1699-1702
Author(s):  
Shun Zhen Feng ◽  
Ji Hong Liu ◽  
Pu Hao ◽  
Yan Hui Dong ◽  
Hui Yuan Sun
Keyword(s):  
Room Temperature ◽  
Annealing Temperature ◽  
Magnetic Domain ◽  
Magnetic Domains ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Substrates ◽  
Diffraction Peaks ◽  
Microstructure And Magnetic Properties

Ti(3nm)/Ni(10nm)/Ti(3nm) films were deposited directly on glass substrates using dc facing-target magnetron sputtering system at room temperature and in situ-annealed from room temperature(RT) to annealing temperature(Ta) 500°C, respectively. At Ta = 400°C, the gain size was about 15 nm, and the magnetic domains of the films distributed homogenously, and the magnetic domain cluster size was nearly 25 nm. The maximum perpendicular coercivity of Ti(3nm)/Ni(10nm)/Ti(3nm) films was 1360 Oe. The segregation or diffusion of Ti and the stress anisotropy played important roles to increase the coercivity. The intergrain interaction of films was obtained by δM plots. In annealing films, X-ray diffraction (XRD) profiles showed two diffraction peaks of NiTi monoclinic structure (002), (111) lattice orientations.

Lorentz microscopy study of magnetic domain walls in Fe-Cr-Co alloys

1978 ◽  
Vol 36 (1) ◽  
pp. 462-463
Author(s):  
Yalcin Belli
Keyword(s):  
Domain Walls ◽  
Magnetic Domain ◽  
Microscopy Study ◽  
Ferromagnetic Phase ◽  
Stable Phase ◽  
Magnetic Domains ◽  
Lorentz Microscopy ◽  
Magnetic Hardening ◽  
Electron Microscopes ◽  
Co Alloys

Fe-Cr-Co alloys have great technological potential to replace Alnico alloys as hard magnets. The relationship between the microstructures and the magnetic properties has been recently established for some of these alloys. The magnetic hardening has been attributed to the decomposition of the high temperature stable phase (α) into an elongated Fe-rich ferromagnetic phase (α1) and a weakly magnetic or non-magnetic Cr-rich phase (α2). The relationships between magnetic domains and domain walls and these different phases are yet to be understood. The TEM has been used to ascertain the mechanism of magnetic hardening for the first time in these alloys. The present paper describes the magnetic domain structure and the magnetization reversal processes in some of these multiphase materials. Microstructures to change properties resulting from, (i) isothermal aging, (ii) thermomagnetic treatment (TMT) and (iii) TMT + stepaging have been chosen for this investigation. The Jem-7A and Philips EM-301 transmission electron microscopes operating at 100 kV have been used for the Lorentz microscopy study of the magnetic domains and their interactions with the finely dispersed precipitate phases.

Magnetic Material Observation Assembly for Tem with a Eucentric Goniometer

1976 ◽  
Vol 34 ◽  
pp. 540-541
Author(s):  
K. Shi rota ◽  
A. Yonezawa ◽  
K. Shibatomi ◽  
T. Yanaka
Keyword(s):  
Magnetic Material ◽  
Electron Microscope ◽  
Magnetic Domain ◽  
Objective Lens ◽  
Magnetic Domains ◽  
Lorentz Microscopy ◽  
Transmission Electron ◽  
Correction Of Astigmatism ◽  
Single Orientation ◽  
Conventional Transmission Electron Microscope

As is well known, it is not so easy to operate a conventional transmission electron microscope for observation of magnetic materials. The reason is that the instrument requires re-alignment of the axis and re-correction of astigmatism after each specimen shift, as the lens field is greatly disturbed by the specimen. With a conventional electron microscope, furthermore, it is impossible to observe magnetic domains, because the specimen is magnetized to single orientation by the lens field. The above mentioned facts are due to the specimen usually being in the lens field. Thus, special techniques or systems are usually required for magnetic material observation (especially magnetic domain observation), for example, the technique to switch off the objective lens current and Lorentz microscopy. But these cannot give high image quality and wide magnification range, and furthermore Lorentz microscopy is very complicated.

Highlights in the history of X-ray topography1

1995 ◽  
Vol 210 (6) ◽  
Author(s):  
A. R. Lang
Keyword(s):  
Magnetic Domain ◽  
Diffraction Theory ◽  
Dislocation Loops ◽  
X Ray Diffraction ◽  
X Ray ◽  
Domain Structures ◽  
Structure Factors ◽  
History Of ◽  
Dislocation Sources ◽  
Non Destructive

AbstractX-ray topography provides a non-destructive method of mapping point-by-point variations in orientation and reflecting power within crystals. The discovery, made by several workers independently, that in nearly perfect crystals it was possible to detect individual dislocations by X-ray diffraction contrast started an epoch of rapid exploitation of X-ray topography as a new, general method for assessing crystal perfection. Another discovery, that of X-ray Pendellösung, led to important theoretical developments in X-ray diffraction theory and to a new and precise method for measuring structure factors on an absolute scale. Other highlights picked out for mention are studies of Frank-Read dislocation sources, the discovery of long dislocation helices and lines of coaxial dislocation loops in aluminium, of internal magnetic domain structures in Fe-3 wt.% Si, and of stacking faults in silicon and natural diamonds.

scholarly journals Soft x-ray absorption spectroscopy and magnetic circular dichroism as operando probes of complex oxide electrolyte gate transistors

2020 ◽  
Vol 116 (20) ◽  
pp. 201905
Author(s):  
Biqiong Yu ◽  
Guichuan Yu ◽  
Jeff Walter ◽  
Vipul Chaturvedi ◽  
Joseph Gotchnik ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Absorption Spectroscopy ◽  
Magnetic Circular Dichroism ◽  
Complex Oxide ◽  
X Ray ◽  
X Ray Absorption ◽  
Circular Dichroïsm ◽  
Oxide Electrolyte

scholarly journals Demonstration of Geometric Effects and Resonant Scattering in the X-Ray Spectra of High-Energy-Density Plasmas

2021 ◽  
Vol 126 (8) ◽  
Author(s):  
G. Pérez-Callejo ◽  
E. V. Marley ◽  
D. A. Liedahl ◽  
L. C. Jarrott ◽  
G. E. Kemp ◽  
...  
Keyword(s):  
Energy Density ◽  
Resonant Scattering ◽  
High Energy ◽  
High Energy Density ◽  
X Ray ◽  
High Energy Density Plasmas ◽  
Geometric Effects

MAGNETIC MICROSPECTROSCOPY BY A COMBINATION OF XMCD AND PEEM

2002 ◽  
Vol 09 (02) ◽  
pp. 877-881 ◽  
Author(s):  
S. IMADA ◽  
S. SUGA ◽  
W. KUCH ◽  
J. KIRSCHNER
Keyword(s):  
Circular Dichroism ◽  
Full Advantage ◽  
Quantitative Evaluation ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
Magnetic Domain ◽  
X Ray ◽  
Circular Dichroïsm

The benefits of combining soft X-ray magnetic circular dichroism and photoelectron microscopy are demonstrated by applying this combination (XMCD–PEEM) not only to magnetic domain imaging but also to quantitative evaluation of the distribution of spin and orbital magnetic moments. The latter takes full advantage of the spectroscopic aspect of XMCD–PEEM.

Image Contrast of Lattice Defects in X-Ray Topography by Resonant Scattering

2001 ◽  
Vol 40 (Part 2, No. 8B) ◽  
pp. L884-L887 ◽  
Author(s):  
Riichirou Negishi ◽  
Masami Yoshizawa ◽  
Shengming Zhou ◽  
Isao Matsumoto ◽  
Tomoe Fukamachi ◽  
...  
Keyword(s):  
Resonant Scattering ◽  
Image Contrast ◽  
Lattice Defects ◽  
X Ray
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