The Experts below are selected from a list of 8091 Experts worldwide ranked by ideXlab platform
Peter Fischer - One of the best experts on this subject based on the ideXlab platform.
-
Three-dimensional Nanomagnetism
Nature Communications, 2017Co-Authors: Amalio Fernández-pacheco, Peter Fischer, Robert Streubel, Olivier Fruchart, Riccardo Hertel, Russell P. CowburnAbstract:Nanoscale magnetic devices play a key role in modern technologies but current applications involve only 2D structures like magnetic discs. Here the authors review recent progress in the fabrication and understanding of 3D magnetic nanostructures, enabling more diverse functionalities. Magnetic nanostructures are being developed for use in many aspects of our daily life, spanning areas such as data storage, sensing and biomedicine. Whereas patterned nanomagnets are traditionally two-dimensional planar structures, recent work is expanding Nanomagnetism into three dimensions; a move triggered by the advance of unconventional synthesis methods and the discovery of new magnetic effects. In three-dimensional nanomagnets more complex magnetic configurations become possible, many with unprecedented properties. Here we review the creation of these structures and their implications for the emergence of new physics, the development of instrumentation and computational methods, and exploitation in numerous applications.
-
three dimensional Nanomagnetism
Nature Communications, 2017Co-Authors: Amalio Fernandezpacheco, Peter Fischer, Robert Streubel, Olivier Fruchart, Riccardo Hertel, R P CowburnAbstract:This work has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreements no. 309589: M3d, and no. 247368: 3SPIN. A.F-P. acknowledges support from an EPSRC Early Career Fellowship, EP/M008517/1 and from a Winton Fellowship. R.S. and P.F. acknowledge support by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under contract no. DE-AC02-05-CH11231 within the Non-Equilibrium Magnetic Materials programme (MSMAG).
-
Three-dimensional Nanomagnetism
Nature Communications, 2017Co-Authors: Amalio Fernández-pacheco, Peter Fischer, Robert Streubel, Olivier Fruchart, Riccardo Hertel, Russell P. CowburnAbstract:Magnetic nanostructures are being developed for use in many aspects of our daily life, spanning areas such as data storage, sensing and biomedicine. Whereas patterned nanomagnets are traditionally two-dimensional planar structures, recent work is expanding Nanomagnetism into three dimensions; a move triggered by the advance of unconventional synthesis methods and the discovery of new magnetic effects. In three-dimensional nanomagnets more complex magnetic configurations become possible, many with unprecedented properties. Here we review the creation of these structures and their implications for the emergence of new physics, the development of instrumentation and computational methods, and exploitation in numerous applications.
-
exploring Nanomagnetism with soft x ray microscopy
Lawrence Berkeley National Laboratory, 2008Co-Authors: Peter Fischer, Dong-hyun Kim, Weilun Chao, Brooke L Mesler, Anne Sakdinawat, Erik H. AndersonAbstract:Exploring Nanomagnetism with soft X-ray microscopy Peter Fischer, Dong-Hyun Kim, Brooke L. Mesler, Weilun Chao, Anne E. Sakdinawat, Erik H. Anderson Center for X-ray Optics Lawrence Berkeley National Laboratory Berkeley CA U.S.A. PJFischer@lbl.gov http://www.cxro.lbl.gov/BL612 Corresponding author: Peter Fischer Center for X-ray Optics Lawrence Berkeley National Laboratory MS 2-400 1 Cyclotron Road Berkeley CA 94720 U.S.A. phone : +1 510 486 7052 fax: +1 510 486 4550 email: PJFischer@lbl.gov http://www.cxro.lbl.gov/~pjfischer/index.php
-
exploring Nanomagnetism with soft x ray microscopy
Surface Science, 2007Co-Authors: Peter Fischer, Dong-hyun Kim, Weilun Chao, Brooke L Mesler, Anne Sakdinawat, Erik H. AndersonAbstract:Abstract Magnetic soft X-ray microscopy images magnetism in nanoscale systems with a spatial resolution down to 15 nm provided by state-of-the-art Fresnel zone plate optics. X-ray magnetic circular dichroism (X-MCD) is used as the element-specific magnetic contrast mechanism similar to photoemission electron microscopy (PEEM), however, with volume sensitivity and the ability to record the images in varying applied magnetic fields which allows study of magnetization reversal processes at fundamental length scales. Utilizing a stroboscopic pump–probe scheme one can investigate fast spin dynamics with a time resolution down to 70 ps which gives access to precessional and relaxation phenomena as well as spin torque driven domain wall dynamics in nanoscale systems. Current developments in zone plate optics aim for a spatial resolution towards 10 nm and at next generation X-ray sources a time resolution in the fs regime can be envisioned.
S. D. Bader - One of the best experts on this subject based on the ideXlab platform.
-
issues in Nanomagnetism
ChemInform, 2008Co-Authors: S. D. Bader, Axel Hoffmann, Kristen Buchanan, S H Chung, Konstantin Yu Guslienko, Valentyn NovosadAbstract:Abstract An overview is provided of recent work at Argonne that covers three aspects of Nanomagnetism. The first is in the area of spin transport, where all-metallic lateral spin valves are explored. The second is in the area of spin dynamics, where a variety of magnetic vortex geometries are summarized. And the third is in the area of self-assembly, where capsid templates derived from viruses are used to contain the growth of magnetic nanoparticles. In each case issues are highlighted associated with the relation between magnetism and structure.
-
Opportunities in Nanomagnetism
Bulletin of the American Physical Society, 2007Co-Authors: S. D. BaderAbstract:This talk discusses challenges and scientific problems in the emerging area of Nanomagnetism. [1] Included are experiments that explore spin-related transport and dynamical behavior in metallic systems, as well as efforts to understand the observed phenomena. As a subfield of nanoscience, Nanomagnetism shares many of the same basic organizing principles, such as geometric confinement, physical proximity, and chemical self-organization. These principles are illustrated by means of examples, including one that shows the synergetic relationship to other fields of science, the manipulation of viruses to fabricate magnetic nanoparticles.
-
Colloquium: Opportunities in Nanomagnetism
Reviews of Modern Physics, 2006Co-Authors: S. D. BaderAbstract:Nanomagnetism is the discipline dealing with magnetic phenomena specific to structures having dimensions in the submicron range. This Colloquium addresses the challenges and scientific problems in this emerging area, including its fabrication strategies, and describes experiments that explore new spin-related behaviors in metallic systems as well as theoretical efforts to understand the observed phenomena. As a subfield of nanoscience, Nanomagnetism shares many of the same basic organizing principles such as geometric confinement, physical proximity, and chemical self-organization. These principles are illustrated by means of several examples drawn from the quests for ultrastrong permanent magnets, ultra-high-density magnetic recording media, and nanobiomagnetic sensing strategies. As a final example showing the synergetic relationships to other fields of science, this Colloquium discusses the manipulation of viruses to fabricate magnetic nanoparticles.
-
Advances in Nanomagnetism via X-ray techniques
Journal of Magnetism and Magnetic Materials, 2006Co-Authors: George Srajer, Laura H. Lewis, S. D. Bader, A. J. Epstein, Charles S. Fadley, Eric E. Fullerton, Axel Hoffmann, Jeffrey B. Kortright, Kannan M. Krishnan, Sara A. MajetichAbstract:This report examines the current status and the future directions of the field of Nanomagnetism and assesses the ability of hard X-ray synchrotron facilities to provide new capabilities for making advances in this field. The report first identifies major research challenges that lie ahead in three broadly defined subfields of Nanomagnetism: confined systems, clusters and complex oxides. It then examines the relevant experimental capabilities that are currently available at hard X-ray synchrotron light sources, using the Advanced Photon Source (APS) at Argonne as an example. Finally, recommendations are made for future development in X-ray facilities that will enhance the study of Nanomagnetism, including new experimental directions, modifications that would enable in situ sample preparation, and measurements at high magnetic fields and/or low temperatures. In particular, in situ sample preparation is of high priority in many experiments, especially those in the area of surface magnetism.
-
A materials chemistry perspective on Nanomagnetism
Journal of Materials Chemistry, 2005Co-Authors: Seth B. Darling, S. D. BaderAbstract:Nanomagnetism encompasses naturally occurring magnetic molecules and clusters as well as artificially structured low-dimensional magnetic materials. Basic research areas include the pursuit of novel interfacial magnetic coupling and spin-transport phenomena and creating new magnetic electronic architectures. In addition to the study of fundamental magnetic phenomena, nanomagnets may in the future form the basis of emerging technologies, such as in ultra-high density data storage media, ultra-strong permanent magnets, and biological and chemical sensing. Herein we highlight materials chemistry contributions to the quest for new magnetic functionalities, including the fabrication of surfactant-mediated magnetic particles and soft matter templates as platforms for hierarchically assembled hybrid magnetic materials. Nanomagnetism is positioned at the frontier between chemistry and magnetism. Devising methods to organize functional magnetic nanostructures draws on the unique strengths of a diverse materials chemistry community.
Wolfgang Wernsdorfer - One of the best experts on this subject based on the ideXlab platform.
-
From micro- to nano-SQUIDs: applications to Nanomagnetism
Superconductor Science and Technology, 2009Co-Authors: Wolfgang WernsdorferAbstract:Due to a growing interest in quantum information processing based on spin systems, the micro-SQUID technique has been finding new interest and fabrication improvements have led to nano-SQUIDs. There are two types of nano-SQUIDs: either the cross section of the Josephson junctions is reduced to about 1 nm by using carbon nanotube junctions, or the loop size is reduced to a few 100 nm. This paper reviews the basic ideas of the micro-SQUID technique applied to magnetic nanostructures and shows that both types of nano-SQUIDs lead to a significant improvement concerning the detection of magnetization switching of individual magnetic particles or molecules.
-
A perspective on combining molecular nanomagnets and carbon nanotube electronics
Inorganica Chimica Acta, 2008Co-Authors: Lapo Bogani, Wolfgang WernsdorferAbstract:We present the promising perspectives offered by the combination of carbon nanotube-based electronics and molecular Nanomagnetism. The transport properties of carbon nanotubes are first described, with particular attention to the working principles of two devices that can be expected to play a major role in merging the two fields. We then detail the fabrication steps needed for nanotube-based devices that shall be considered when developing strategies for hybrid devices. Finally, we discuss the possible chemical routes to the creation of molecular nanomagnets/carbon-nanotube hybrid devices, highlighting the fundamental requirements for the creation of working systems and for the observation of spin effects on transport properties of carbon nanotubes.
W Stefanowicz - One of the best experts on this subject based on the ideXlab platform.
-
sensitive squid magnetometry for studying Nanomagnetism
Semiconductor Science and Technology, 2011Co-Authors: M Sawicki, W StefanowiczAbstract:The superconducting quantum interference device (SQUID) magnetometer is one of the most sensitive experimental techniques to magnetically characterize samples with high sensitivity. Here we present a detailed discussion of possible artifacts and pitfalls characteristic for commercial SQUID magnetometers. This includes intrinsic artifacts which stem from the inherent design of the magnetometer as well as potential issues due to the user. We provide some guidelines on how to avoid and correct these, which is of particular importance when the proper magnetization of nanoscale objects will be established in cases where its response is dwarfed by that of the substrate it comes with, a situation frequently found in the field of Nanomagnetism.
S. Sun - One of the best experts on this subject based on the ideXlab platform.
-
Chemical Synthesis of Monodisperse Magnetic Nanoparticles for Sensitive Cancer Detection
Journal of Inorganic and Organometallic Polymers and Materials, 2014Co-Authors: S. SunAbstract:This short tutorial review highlights the advance in high temperature solution phase chemical synthesis of monodisperse magnetic nanoparticles (MNPs), especially iron oxide NPs, as contrast enhancement agents for cancer detection by magnetic resonance imaging (MRI). It introduces briefly the unique Nanomagnetism of MNPs required for MRI. It then summarizes some typical methods used to prepare monodisperse Fe_3O_4 and ferrite MFe_2O_4 MNPs from high temperature organic phase reaction with controlled magnetic properties. It further outlines the chemistry used to make these MNPs biocompatible and target-specific. Finally it presents two examples to demonstrate the MNP control achieved from chemical synthesis for sensitive detection of cancer.
-
cobalt substituted magnetite nanoparticles and their assembly into ferrimagnetic nanoparticle arrays
Advanced Materials, 2013Co-Authors: Adriana Mendozagarcia, Bo Ning, S. SunAbstract:12 ] based alloy NPs are ideal building blocks for fabricating FM NP arrays and for studying Nanomagnetism due to the strong ferromagnetism observed within their unique structure. How-ever, monodisperse FePt NPs prepared from solution phase syntheses tend to be super-paramagnetic and require high-temperature annealing to convert their super-paramagnetism to strong ferromagnetism, which often causes NP aggregation or even sintering.
-
Synthesis and assembly of magnetic nanoparticles for information and energy storage applications
Frontiers of Physics in China, 2010Co-Authors: Hongwang Zhang, Yi Liu, S. SunAbstract:This mini-review summarizes the recent advances in chemical synthesis and assembly of monodisperse magnetic nanoparticles for magnetic applications. After a brief introduction to Nanomagnetism, the review focuses on recent developments in solution phase syntheses and assemblies of monodisperse Fe, CoFe, FePt and SmCo5 nanoparticles. The review further outlines the structural and magnetic properties of these nanoparticles for magnetic information and energy storage applications.
-
Recent Advances in Chemical Synthesis, Self-Assembly, and Applications of FePt Nanoparticles.
Advanced Materials, 2006Co-Authors: S. SunAbstract:This paper reviews recent advances in chemical synthesis, self-assembly, and potential applications of monodisperse binary FePt nanoparticles. After a brief introduction to Nanomagnetism and conventional processes of fabricating FePt nanoparticles, the paper focuses on recent developments in solution-phase syntheses of monodisperse FePt nanoparticles and their self-assembly into nanoparticle superlattices. The paper further outlines the surface, structural, and magnetic properties of the FePt nanoparticles and gives examples of three potential applications in data storage, permanent magnetic nanocomposites, and biomedicine.
