scholarly journals Magnetic measurements on micrometer-sized samples under high pressure using designed NV centers

Science ◽  
2019 ◽  
Vol 366 (6471) ◽  
pp. 1359-1362 ◽  
Author(s):  
Margarita Lesik ◽  
Thomas Plisson ◽  
Loïc Toraille ◽  
Justine Renaud ◽  
Florent Occelli ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Pressures ◽  
Magnetic Measurements ◽  
Nitrogen Vacancy ◽  
Magnetic Interactions ◽  
Superconducting Transition ◽  
Spatially Resolved ◽  
Optical Magnetometry ◽  
Diamond Anvil ◽  
Nv Centers

Pressure can be used to tune the interplay among structural, electronic, and magnetic interactions in materials. High pressures are usually applied in the diamond anvil cell, making it difficult to study the magnetic properties of a micrometer-sized sample. We report a method for spatially resolved optical magnetometry based on imaging a layer of nitrogen-vacancy (NV) centers created at the surface of a diamond anvil. We illustrate the method using two sets of measurements realized at room temperature and low temperature, respectively: the pressure evolution of the magnetization of an iron bead up to 30 gigapascals showing the iron ferromagnetic collapse and the detection of the superconducting transition of magnesium dibromide at 7 gigapascals.

scholarly journals Imaging stress and magnetism at high pressures using a nanoscale quantum sensor

Science ◽  
2019 ◽  
Vol 366 (6471) ◽  
pp. 1349-1354 ◽  
Author(s):  
S. Hsieh ◽  
P. Bhattacharyya ◽  
C. Zu ◽  
T. Mittiga ◽  
T. J. Smart ◽  
...  
Keyword(s):  
High Pressures ◽  
Nitrogen Vacancy ◽  
Temperature Phase ◽  
Sensing Platform ◽  
Noise Spectroscopy ◽  
Magnetic Signatures ◽  
Diamond Anvils ◽  
Diamond Anvil ◽  
Nanoscale Sensing ◽  
High Pressure Phenomena

Pressure alters the physical, chemical, and electronic properties of matter. The diamond anvil cell enables tabletop experiments to investigate a diverse landscape of high-pressure phenomena. Here, we introduce and use a nanoscale sensing platform that integrates nitrogen-vacancy (NV) color centers directly into the culet of diamond anvils. We demonstrate the versatility of this platform by performing diffraction-limited imaging of both stress fields and magnetism as a function of pressure and temperature. We quantify all normal and shear stress components and demonstrate vector magnetic field imaging, enabling measurement of the pressure-driven α↔ϵ phase transition in iron and the complex pressure-temperature phase diagram of gadolinium. A complementary NV-sensing modality using noise spectroscopy enables the characterization of phase transitions even in the absence of static magnetic signatures.

Synchrotron Moessbauer Spectroscopy and Resistivity Studies of Iron Oxide Under High Pressure

2006 ◽  
Vol 987 ◽  
Author(s):  
Viktor V. Struzhkin ◽  
Mikhail I. Eremets ◽  
Ivan M. Eremets ◽  
Jung-Fu Lin ◽  
Wolfgang Sturhahn ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
High Pressures ◽  
Structural Phase ◽  
Experimental Studies ◽  
Magnetic Interactions ◽  
Diamond Anvil

AbstractThe strong electron correlations play a crucial role in the formation of a variety of electronic and magnetic properties of the transition metal oxides. In strongly correlated electronic materials many theoretical predictions exist on pressure-induced insulator-metal transitions, which are followed by a collapse of localized magnetic moments and by structural phase transitions [1]. The high-pressure studies provide additional degree of freedom to control the structural, electronic, optical, and magnetic properties of transition metal oxides. With the development of the high-pressure diamond-anvil-cell technique the experimental studies of such transitions are now possible with the advanced synchrotron techniques. In our studies, the iron monooxide Fe0.94O was studied under high pressures up to 200 GPa in diamond anvil cells. The single crystals enriched with Fe57 isotopes have been prepared for nuclear resonance measurements. The results of synchrotron Mössbauer spectroscopy (nuclear forward scattering -NFS), and electro-resistivity measurements suggest a complicated scenario of magnetic interactions governed by band-broadening effects.

Adhesion of nanostructured diamond film on a copper–beryllium alloy

2008 ◽  
Vol 23 (9) ◽  
pp. 2373-2381 ◽  
Author(s):  
Shane A. Catledge ◽  
Yogesh K. Vohra ◽  
Damon D. Jackson ◽  
Samuel T. Weir
Keyword(s):  
Diamond Anvil Cell ◽  
High Pressures ◽  
Microwave Plasma ◽  
Magnetic Measurements ◽  
Pure Copper ◽  
Chemical Vapor ◽  
Sample Volume ◽  
Diamond Coatings ◽  
Diamond Anvil ◽  
Copper Beryllium

Microwave plasma chemical vapor deposition (CVD) was used to coat nanostructured diamond onto a copper–beryllium alloy (∼1.7 wt% Be) commonly used as a nonmagnetic gasket material in diamond anvil cell devices. The coating is expected to be useful in preventing plastic flow of Cu–Be gaskets in diamond anvil cell devices, thus allowing for increased sample volume at high pressures and leading to improved sensitivity of magnetic measurements. The coatings were characterized by Raman spectroscopy, glancing-angle x-ray diffraction, microscopy (optical, scanning electron, and atomic force), Rockwell indentation, and nanoindentation. CVD diamond deposition on pure copper substrates has historically resulted in poor coating adhesion caused by the very large thermal expansion mismatch between the substrate and coating as well as the inability of copper to form a carbide phase at the interface. While an interfacial graphite layer formed on the pure copper substrates and resulted in complete film delamination, well-adhered 12.5 μm thick nanostructured diamond coatings were produced on the copper–beryllium (Cu–Be) alloy. The nanostructured diamond coatings on Cu–Be exhibit hardness of up to 84 GPa and can withstand strains from Rockwell indentation loads up to 150 kg without delamination.

scholarly journals High Pressure Low Temperature Studies on 1-2-2 Iron-based Superconductors Using Designer Diamond Cells

2013 ◽  
Vol 1582 ◽  
Author(s):  
Walter O. Uhoya ◽  
Georgiy M. Tsoi ◽  
Yogesh K. Vohra ◽  
Jonathan, E. Mitchell ◽  
Athena Safa-Sefat ◽  
...  
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
High Pressures ◽  
Density Wave ◽  
Spin Density Wave ◽  
Superconducting Transition ◽  
X Ray Diffraction ◽  
Iron Based Superconductors ◽  
Diamond Anvil ◽  
Iron Based

ABSTRACTHigh pressure low temperature electrical resistance measurements were carried out on a series of 122 iron-based superconductors using a designer diamond anvil cell. These studies were complemented by image plate x-ray diffraction measurements under high pressures and low temperatures at beamline 16-BM-D, HPCAT, Advanced Photon Source. A common feature of the 1-2-2 iron-based materials is the observation of anomalous compressibility effects under pressure and a Tetragonal (T) to Collapsed Tetragonal (CT) phase transition under high pressures. Specific studies on antiferromagnetic spin-density-wave Ba0.5Sr0.5Fe2As2 and Ba(Fe0.9Ru0.1)2As2 samples are presented to 10 K and 41 GPa. The collapsed tetragonal phase was observed at a pressure of 14 GPa in Ba0.5Sr0.5Fe2As2 at ambient temperature. The highest superconducting transition temperature in Ba0.5Sr0.5Fe2As2 was observed to be at 32 K at a pressure of 4.7 GPa. The superconductivity was observed to be suppressed on transformation to the CT phase in 122 materials.

CATHODOLUMINESCENCE AND PHOTOLUMINESCENCE OF NV CENTERS

2012 ◽  
Vol 11 (04) ◽  
pp. 1240016
Author(s):  
DAVID ROY-GUAY ◽  
MICHEL PIORO-LADRIÈRE ◽  
DENIS MORRIS ◽  
ALEXANDRE TALLAIRE ◽  
JOCELYN ACHARD ◽  
...  
Keyword(s):  
Electromagnetic Fields ◽  
Room Temperature ◽  
High Amplitude ◽  
Nitrogen Vacancy ◽  
Tuning Parameter ◽  
Frequency Range ◽  
Electromagnetic Environment ◽  
Promising Candidate ◽  
On Demand ◽  
Nv Centers

Nitrogen-vacancy (NV) centers in diamond are a promising candidate as a solid state qubit memory for quantum information as they possess very long coherence times even at room temperature. Furthermore, NV centers are very sensitive to their electromagnetic environment and are addressable in the GHz frequency range. Here we review our progress towards the detection of single NV centers for the implementation of fast on demand coupling between NV centers and GHz electromagnetic fields. Precisely, we present efforts towards mapping NV centers with a cathodoluminescence setup. Developing such capability is important for patterning local one-qubit gates for the application of high amplitude electromagnetic fields as a tuning parameter.

scholarly journals Spatially-resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry

2018 ◽  
Vol 20 (4) ◽  
pp. 043010 ◽  
Author(s):  
N M Nusran ◽  
K R Joshi ◽  
K Cho ◽  
M A Tanatar ◽  
W R Meier ◽  
...  
Keyword(s):  
Meissner Effect ◽  
Spatially Resolved ◽  
Optical Magnetometry ◽  
Nv Centers

Photoelectrical imaging and coherent spin-state readout of single nitrogen-vacancy centers in diamond

Science ◽  
2019 ◽  
Vol 363 (6428) ◽  
pp. 728-731 ◽  
Author(s):  
Petr Siyushev ◽  
Milos Nesladek ◽  
Emilie Bourgeois ◽  
Michal Gulka ◽  
Jaroslav Hruby ◽  
...  
Keyword(s):  
Spin State ◽  
Room Temperature ◽  
Information Science ◽  
Signal To Noise Ratio ◽  
Nitrogen Vacancy ◽  
Fully Integrated ◽  
Single Defect ◽  
Optical Readout ◽  
Nitrogen Vacancy Centers ◽  
Nv Centers

Nitrogen-vacancy (NV) centers in diamond have become an important instrument for quantum sensing and quantum information science. However, the readout of NV spin state requires bulky optical setups, limiting fabrication of miniaturized compact devices for practical use. Here we realized photoelectrical detection of magnetic resonance as well as Rabi oscillations on a single-defect level. Furthermore, photoelectrical imaging of individual NV centers at room temperature was demonstrated, surpassing conventional optical readout methods by providing high imaging contrast and signal-to-noise ratio. These results pave the way toward fully integrated quantum diamond devices.

Pressure tuning IR and micro-raman spectra of solid zeiseߣs salt, kp[pt(η-C2H4)Cl4], and the related dimer, [Pt(η-C2H4)Cl2]2

1992 ◽  
Vol 50 (2) ◽  
pp. 1536-1537
Author(s):  
Jean Baldwin ◽  
Ian S. Butler ◽  
Denis F. R. Gilson
Keyword(s):  
Raman Spectra ◽  
Room Temperature ◽  
High Pressures ◽  
Carbonyl Groups ◽  
Phase Transition Behavior ◽  
Metal Compounds ◽  
Raman Spectroscopic ◽  
Pressure Tuning ◽  
Diamond Anvil ◽  
Considerable Controversy

Pressure-tuning vibrational spectroscopy using diamond-anvil cells is now well established as a useful technique for investigating the phase-transition behavior of inorganic and organic solids. Much of our recent research has been focused on organotransition metal compounds, especially metal carbonyls. The pressure dependences (dv/dP) of the v(CO) modes provide important information on the extent of #- backbonding between the metals and the carbonyl groups. We have now extended these high-presure studies to other #-acceptor ligands, including olefins. We report here the results of a high-pressure IR and micro-Raman spectroscopic investigation of the ethylene complexes, K[Pt(η-C2H4)C13] (Zeise's salt) and the related dimeric species, [Pt(η-C2H4)C12]2- We were interested in examining the effect of high pressures on the Dewar-Chatt-Ducanson σ-/π-bonding description of the platinum-ethylene bonding. There is still considerable controversy over the relative σ- and π-contributions to the overall bonding in such metal-olefin complexes.Micro-Raman spectra of solid K[Pt(η-C2H4)C13] were obtained at room temperature for the low-energy region (500-180 cm-1) at varying pressures up to 33 kbar with the aid of a diamond-anvil cell. Similarly, pressure-tuning IR spectra were measured for Zeise's salt (3080-480 cm-1; 32 kbar) and Zeise's dimer (4000-480 cm-1; 28 kbar) up to the pressures indicated.

Epitaxial growth and room-temperature ferromagnetism of quasi-2D layered Cr4Te5thin film

2022 ◽  
Author(s):  
Jing Wang ◽  
Weiyuan Wang ◽  
Jiyu Fan ◽  
Huan Zheng ◽  
Hao Liu ◽  
...  
Keyword(s):  
Thin Films ◽  
Single Crystal ◽  
Large Scale ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Room Temperature Ferromagnetism ◽  
Magnetic Interactions ◽  
Large Area ◽  
Easy Magnetization ◽  
Mean Field Model

Abstract Large-scale growth of two-dimensional (2D) ferromagnetic thin films will provide an ideal platform for studying 2D magnetism and active spintronic devices. However, controllable growth of 2D ferromagnets over large areas faces tremendous challenges. Herein, we report a large-area growth of 2D ferromagnetic single-crystal thin films Cr4Te5 on Al2O3 (0001) substrates using pulsed laser deposition. X-ray diffraction patterns and atomic force microscopy detection confirm that all thin films are high quality epitaxy together with atom-level smooth. Magnetic measurements show the persistence of ferromagnetic ordering state up to above room temperature, with a Curie temperature 320 K, atomic magnetic moment 0.307µB/Cr, and the easy-magnetization axis in film plane. Comparing bulk Cr4Te5 single-crystal, the critical exponent β=0.491 indicates that the magnetic interactions of thin film obey mean-field model rather than 3D Heisenberg model. This work will open a avenue for growing large-scale 2D ferromagnet and developing room temperature 2D magnet-based nanodevices.

Photoluminescence and Magnetic Properties of Undoped and (Mn, Co) co-doped ZnO Nanoparticles

2020 ◽  
Vol 16 (4) ◽  
pp. 655-666
Author(s):  
Mona Rekaby
Keyword(s):  
Magnetic Properties ◽  
Zno Nanoparticles ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Structural Defects ◽  
Ferromagnetic Behavior ◽  
Secondary Phases ◽  
Antiferromagnetic Ordering ◽  
Doped Zno ◽  
Co Doped

Objective: The influence of Manganese (Mn2+) and Cobalt (Co2+) ions doping on the optical and magnetic properties of ZnO nanoparticles was studied. Methods: Nanoparticle samples of type ZnO, Zn0.97Mn0.03O, Zn0.96Mn0.03Co0.01O, Zn0.95Mn0.03 Co0.02O, Zn0.93Mn0.03Co0.04O, and Zn0.91Mn0.03Co0.06O were synthesized using the wet chemical coprecipitation method. Results: X-ray powder diffraction (XRD) patterns revealed that the prepared samples exhibited a single phase of hexagonal wurtzite structure without any existence of secondary phases. Transmission electron microscope (TEM) images clarified that Co doping at high concentrations has the ability to alter the morphologies of the samples from spherical shaped nanoparticles (NPS) to nanorods (NRs) shaped particles. The different vibrational modes of the prepared samples were analyzed through Fourier transform infrared (FTIR) measurements. The optical characteristics and structural defects of the samples were studied through Photoluminescence (PL) spectroscopy. PL results clarified that Mn2+ and Co2+ doping quenched the recombination of electron-hole pairs and enhanced the number of point defects relative to the undoped ZnO sample. Magnetic measurements were carried out at room temperature using a vibrating sample magnetometer (VSM). (Mn, Co) co-doped ZnO samples exhibited a ferromagnetic behavior coupled with paramagnetic and weak diamagnetic contributions. Conclusion: Mn2+ and Co2+ doping enhanced the room temperature Ferromagnetic (RTFM) behavior of ZnO. In addition, the signature for antiferromagnetic ordering between the Co ions was revealed. Moreover, a strong correlation between the magnetic and optical behavior of the (Mn, Co) co-doped ZnO was analyzed.

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