scholarly journals Probing nanoscale behavior of magnetic materials with soft X-ray spectromicroscopy

2012 ◽  
Vol 1 (1) ◽  
pp. 5-15 ◽  
Author(s):  
Peter Fischer ◽  
Charles S. Fadley
Keyword(s):  
Magnetic Properties ◽  
Magnetic Materials ◽  
Spin Dynamics ◽  
Magnetic Nanostructures ◽  
Magnetic Behavior ◽  
Research Area ◽  
X Ray ◽  
Spatially Resolved ◽  
Buried Interfaces ◽  
Analytical Tools

AbstractThe magnetic properties of matter continue to be a vibrant research area driven both by scientific curiosity to unravel the basic physical processes which govern magnetism and the vast and diverse utilization of magnetic materials in current and future devices, e.g., in information and sensor technologies. Relevant length and time scales approach fundamental limits of magnetism and with state-of-the-art synthesis approaches we are able to create and tailor unprecedented properties. Novel analytical tools are required to match these advances and soft X-ray probes are among the most promising ones. Strong and element-specific magnetic X-ray dichroism effects as well as the nanometer wavelength of photons and the availability of fsec short and intense X-ray pulses at upcoming X-ray sources enable unique experimental opportunities for the study of magnetic behavior. This article provides an overview of recent achievements and future perspectives in magnetic soft X-ray spectromicroscopies which permit us to gain spatially resolved insight into the ultrafast spin dynamics and the magnetic properties of buried interfaces of advanced magnetic nanostructures.

scholarly journals Resonant Soft X-ray Reflectivity in the Study of Magnetic Properties of Low-Dimensional Systems

2021 ◽  
Vol 7 (10) ◽  
pp. 136
Author(s):  
Adriano Verna ◽  
Raffaella Capelli ◽  
Luca Pasquali
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Transition Metals ◽  
Exchange Bias ◽  
Theoretical Background ◽  
Proximity Effects ◽  
X Ray ◽  
Buried Interfaces ◽  
Low Dimensional

In this review, the technique of resonant soft X-ray reflectivity in the study of magnetic low-dimensional systems is discussed. This technique is particularly appealing in the study of magnetization at buried interfaces and to discriminate single elemental contributions to magnetism, even when this is ascribed to few atoms. The major fields of application are described, including magnetic proximity effects, thin films of transition metals and related oxides, and exchange-bias systems. The fundamental theoretical background leading to dichroism effects in reflectivity is also briefly outlined.

scholarly journals Effect of thickness and Si substrate morphology in La0.7Sr0.3MnO3/Si thin films

2014 ◽  
Vol 70 (a1) ◽  
pp. C1532-C1532
Author(s):  
Hsiao-Tsu Wang ◽  
Mau- Kuen Wu ◽  
Yu-Cheng Shao ◽  
Yu-Fu Wang ◽  
Shang-Hsien Hsieh ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Electronic Structures ◽  
Magnetic Circular Dichroism ◽  
Magnetic Behavior ◽  
Si Substrate ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption ◽  
Different Thickness

Investigation has been made on atomic, electronic structures and magnetic properties of La0.7Sr0.3MnO3 (LSMO) on Si substrate. The effect of different thickness of LSMO and different morphological [flat and nano-pyramid (NP)] of Si substrate are studied in present work. The result of Mn K-edge extended x-ray absorption fine structure indicates the more disorder of local atomic structure of first shell (Mn-O bound) in the thinner LSMO/Si film. The Mn L3,2-edge x-ray absorption near-edge structure shows the presence of Mn2+ ion on the sample. Furthermore, the Mn L3,2-edge x-ray magnetic circular dichroism reveals that the thinner film (LSMO/Si) has highest magnetic moment, in comparison to that of thick LSMO/Si and LSMO/Si-NP samples. This finding suggests that the appearance Mn2+ may play an important role in magnetic behavior of hetero-junction LSMnO/Si and Si-NP.

scholarly journals A 3D Silverton-Type Polyoxomolybdate Based on {PrMo12O42}: Synthesis, Structure, Photoluminescence and Magnetic Properties

2021 ◽  
Vol 9 ◽  
Author(s):  
Yanxin Zhao ◽  
Xiaopeng Sun ◽  
Yanfang Ji ◽  
Hui Kong ◽  
Shumin Chen ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Variable Temperature ◽  
Three Dimensional ◽  
Magnetic Behavior ◽  
X Ray Diffraction ◽  
Red Emission ◽  
X Ray ◽  
Variable Temperature Magnetic Susceptibility ◽  
Elemental Analyses ◽  
Inorganic Building Block

A three-dimensional (3D) Silverton-type polyoxomolybdate (POMo) with the formula of NH4{Mn4[PrMo12O42]}·18H2O (1) was successfully isolated and well characterized by single crystal X-ray diffraction, X-ray powder diffraction pattern, infrared spectrum, thermogravimetric and elemental analyses. The inorganic building block {PrMo12O42} has formed 3D frameworks via the {MnO6} linker. The excitation of compound 1 in solid state at 375 nm displays red emission. Moreover, variable temperature magnetic susceptibility measurements indicate that the magnetic behavior in compound 1 is dominated by antiferromagnetic interactions.

scholarly journals Nanostructure-Related Magnetic Properties of Various Mesoporous Cobalt Oxide and Cobalt Ferrite Spinel Phases

2019 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Magnetic Properties ◽  
Cobalt Oxide ◽  
Cobalt Ferrite ◽  
Magnetic Ordering ◽  
Magnetic Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spinel Phases ◽  
Ferrite Spinel

Nanostructure-related magnetic properties are investigated systematically for various mesoporous cobalt oxide (Co3O4) and cobalt ferrite (CoFe2O4) spinel phases. Synthesis of thematerials by nanocasting offers the opportunity to obtain materials which are different from each other with respect to both specific surface area and crystallite size. As a result, the respective contributions of two types of interfaces, namely, “solid–gas” and “solid–solid” interfaces, to the magnetic ordering can be distinguished. Structural characterization of the porous materials by X-ray diffraction, N2 physisorption, and electron microscopy as well as investigation of the magnetic behavior (field-dependent magnetization and temperaturedependentsusceptibility) are presented.

Magnetic Study of Nanoferritas CoFe2O4 Obtained by Reaction of Combustion

2014 ◽  
Vol 798-799 ◽  
pp. 402-406
Author(s):  
Polyana Tarciana Araújo Santos ◽  
Pascally M.A. Guerra de Araújo ◽  
Ana Cristina Figueiredo de Melo Costa ◽  
Daniel R. Cornejo
Keyword(s):  
Magnetic Properties ◽  
Infrared Spectroscopy ◽  
High Intensity ◽  
Magnetic Measurements ◽  
Spinel Ferrite ◽  
Magnetic Behavior ◽  
Ferrite Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Peaks

The present work aims to study the magnetic properties of nanoferrita cobalt obtained by combustion reaction. The structural feature as well as the magnetic behavior when in the presence of a magnet and magnetic measurements was investigated. The resulting samples were characterized by X-ray diffraction (XRD), infrared spectroscopy (FTIR), magnetic behavior when in the presence of a magnet and magnetic measurements. The results indicated the phase single the spinel ferrite CoFe2O4, with high intensity of diffraction peaks indicating that the samples are crystalline and nanoparticle formation. The characteristic bands of spinel were observed for nanoferritas CoFe2O4. The ferrite nanoparticles were strongly attracted when in presence the magnet presenting a saturation magnetization of 58.0 emu/g, coercivity of 1.14 kOe.

Investigations on the Magnetic Properties of High-Coercivity Nd40Fe30Co15Al10B5 Bulk Amorphous Alloys

2005 ◽  
Vol 877 ◽  
Author(s):  
L. Bessais ◽  
C. Djëga-Mariadassou ◽  
N. X. Phuc
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Magnetic Behavior ◽  
High Energy ◽  
High Coercivity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Leading Role ◽  
Remanence Ratio ◽  
Transmission Electron

AbstractNd40Fe30Co15Al10B5 bulk amorphous prepared by high energy milling shows a coercivity of 8.1 kOe with a Curie temperature of 645 K. The controlled nanocrystallization enhances the coercivity to 20 kOe and the remanence ratio is equal to 0.59. The coexistence of two crystalline magnetic phases, ferromagnetic Nd2(Fe,Co,Al)14B and antiferromagnetic Nd6(Fe,Co,Al)14 are revealed by x-ray diffraction, high-resolution transmission electron microscopy, magnetization measurements, and Mössbauer spectrometry. The grain size for optimal magnetic properties is around 30 nm. The nucleation process may play a leading role in the high magnetic behavior.

Electron Microscopy in the Study of Magnetic Materials

1985 ◽  
Vol 43 ◽  
pp. 202-205
Author(s):  
P.J. Grundy
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Electron Microscope ◽  
Magnetic Materials ◽  
Domain Structure ◽  
Magnetic Domain ◽  
Magnetic Domain Structure ◽  
X Ray ◽  
Lorentz Microscopy ◽  
Structure And Microstructure

The aim of this paper is to highlight in brief two main areas in recent electron microscope studies of magnetic materials. The first is in detailed micromagnetic investigations of a fundamental kind and the second is the observation and characterisation of magnetic properties, magnetic domain structure and microstructure in technically important materials. Detailed quantitative investigations of micromagnetic features have, of necessity, been confined to specialist techniques of Lorentz microscopy (LEM). However, conventional modes of TEM and SEM, and X-ray microanalysis complement the defocussed or Fresnel mode of LEM in giving a detailed characterisation of iragnetic materials. It is in this context that LEM has found the widest application.

Local Structure and Magnetic Properties of FeMnAl Nanocrystalline and Amorphous Alloys

2011 ◽  
Vol 277 ◽  
pp. 100-105
Author(s):  
Kontan Tarigan ◽  
D. S. Yang ◽  
S. C. Yu
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Milling Time ◽  
Magnetic Behavior ◽  
Time Varying ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nanocrystalline And Amorphous ◽  
Magnetization Saturation ◽  
X Ray Absorption

The structural and the magnetic properties of nanocrystalline and amorphous Fe55Mn10Al35 alloys prepared by the mechanical alloying process are studied as functions of the milling time varying from 1 hr to 48 hrs. Structural analyses based on X-ray diffraction (XRD) and extended X-ray absorption fine structure spectroscopy (EXAFS) reveal that the alloying process took place after 12-hr milling. Nanocrystalline alloys are found until 24-hrs milling, and an amorphous phase afterward. Concerning the magnetic behavior, the data obtained from a vibrating sample magnetometer show that both the magnetization saturation (Ms) and the coercivity (Hc) are dependent strongly on the milling time and the crystallite size. By adjusting the milling time, both appropriate structural transformation and magnetization values are obtained.

Layered and ion implantation specimens as possible reference materials for the electron-probe microanalysis

1992 ◽  
Vol 50 (2) ◽  
pp. 1652-1653
Author(s):  
G. Remond ◽  
R.H. Packwood ◽  
C. Gilles ◽  
S. Chryssoulis
Keyword(s):  
Ion Implantation ◽  
Reference Materials ◽  
Analytical Techniques ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
X Ray ◽  
Spatially Resolved ◽  
Analytical Expressions ◽  
Original Approach ◽  
Depth Concentration

Merits and limitations of layered and ion implanted specimens as possible reference materials to calibrate spatially resolved analytical techniques are discussed and illustrated for the case of gold analysis in minerals by means of x-ray spectrometry with the EPMA. To overcome the random heterogeneities of minerals, thin film deposition and ion implantation may offer an original approach to the manufacture of controlled concentration/ distribution reference materials for quantification of trace elements with the same matrix as the unknown.In order to evaluate the accuracy of data obtained by EPMA we have compared measured and calculated x-ray intensities for homogeneous and heterogeneous specimens. Au Lα and Au Mα x-ray intensities were recorded at various electron beam energies, and hence at various sampling depths, for gold coated and gold implanted specimens. X-ray intensity calculations are based on the use of analytical expressions for both the depth ionization Φ (ρz) and the depth concentration C (ρz) distributions respectively.

Sign in / Sign up

Export Citation Format

Share Document