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Yulong Bai, Ning Jiang, Shifeng Zhao
Nanocluster-assembled FeGa micron-scale discs prepared by low-energy cluster beam deposition were embedded into Bi5Ti3FeO15 matrices to form pseudo 1-3 heterostructure films. The microstructures and multiferroic properties were investigated. Good ferroelectric, piezoelectric, and ferromagnetic properties and giant magnetoelectric effects are achieved for the heterostructure films, which is ascribed to the depression of the clamped effect from the hard substrate for such pseudo 1-3 structures and the multi-interface coupling between the large magnetostrictive coefficient of FeGa micron-scale discs and the high piezoelectric coefficient of the circle surrounding the Bi5Ti3FeO15 matrices...
March 16, 2018: Nanoscale
Yao Zhang, Jie-Sheng Chen, Jie Ma, Jiamin Ni, Masaki Imai, Chishiro Michioka, Yuta Hadano, Marcos A Avila, Toshiro Takabatake, Shiyan Li, Kazuyoshi Yoshimura
One initial and essential question of magnetism is whether the magnetic properties of a material are governed by localized moments or itinerant electrons. Here, we expose the case for the weakly ferromagnetic system FeGa3- y Ge y , wherein these two opposite models are reconciled, such that the magnetic susceptibility is quantitatively explained by taking into account the effects of spin-spin correlation. With the electron doping introduced by Ge substitution, the diamagnetic insulating parent compound FeGa3 becomes a paramagnetic metal as early as at y=0...
March 27, 2018: Proceedings of the National Academy of Sciences of the United States of America
Bonho Koo, Kristian Bader, Ulrich Burkhardt, Michael Baenitz, Peter Gille, Jörg Sichelschmidt
The intermetallic semiconductor FeGa<sub>3</sub> acquires itinerant ferromagnetism upon electron doping by a partial replacement of Ga with Ge. We studied the electron spin resonance (ESR) of high-quality single crystals of FeGa<sub>3-x</sub>Ge<sub>x</sub> for x from 0 up to 0.162 where ferromagnetic order is observed. For x = 0 we observed a well-defined ESR signal, indicating the presence of pre-formed magnetic moments in the semiconducting phase...
December 13, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Daniel B Gopman, Vimal Sampath, Hasnain Ahmad, Supriyo Bandyopadhyay, Jayasimha Atulasimha
We present measurements of the static and dynamic properties of polycrystalline iron-gallium films, ranging from 20 nm to 80 nm and sputtered from an Fe0.8 Ga0.2 target. Using a broadband ferromagnetic resonance setup in a wide frequency range, perpendicular standing spin-wave resonances were observed with the external static magnetic field applied in-plane. The field corresponding to the strongest resonance peak at each frequency is used to determine the effective magnetization, the g -factor and the Gilbert damping...
November 2017: IEEE Transactions on Magnetics
Pierre Gaudriault, Séverine Mazaud-Guittot, Vincent Lavoué, Isabelle Coiffec, Laurianne Lesné, Nathalie Dejucq-Rainsford, Martin Scholze, Andreas Kortenkamp, Bernard Jégou
BACKGROUND: Numerous chemicals are capable of disrupting androgen production, but the possibility that they might act together to produce effects greater than those of the most effective component in the mixture has not been studied directly in human tissues. Suppression of androgen synthesis in fetal life has been associated with testis maldescent, malformations of the genitalia at birth, and poor semen quality later in life. OBJECTIVES: Our aim was to investigate whether chemicals can act together to disrupt androgen production in human fetal testis explants and to evaluate the importance of mixture effects when characterizing the hazard of individual chemicals...
August 4, 2017: Environmental Health Perspectives
Alexander J Grutter, Kathryn L Krycka, Elena V Tartakovskaya, Julie A Borchers, K Sai Madhukar Reddy, Eduardo Ortega, Arturo Ponce, Bethanie J H Stadler
A comprehensive three-dimensional picture of magnetic ordering in high-density arrays of segmented FeGa/Cu nanowires is experimentally realized through the application of polarized small-angle neutron scattering. The competing energetics of dipolar interactions, shape anisotropy, and Zeeman energy in concert stabilize a highly tunable spin structure that depends heavily on the applied field and sample geometry. Consequently, we observe ferromagnetic and antiferromagnetic interactions both among wires and between segments within individual wires...
August 22, 2017: ACS Nano
Xiang-Zhong Chen, Marcus Hoop, Naveen Shamsudhin, Tianyun Huang, Berna Özkale, Qian Li, Erdem Siringil, Fajer Mushtaq, Luca Di Tizio, Bradley J Nelson, Salvador Pané
An FeGa@P(VDF-TrFE) wire-shaped magnetoelectric nanorobot is designed and fabricated to demonstrate a proof-of-concept integrated device, which features wireless locomotion and on-site triggered therapeutics with a single external power source (i.e., a magnetic field). The device can be precisely steered toward a targeted location wirelessly by rotating magnetic fields and perform on-demand magnetoelectrically assisted drug release to kill cancer cells.
February 2017: Advanced Materials
R Fega, U Goyal, H Ross, D Jaroszewski, H Paripati, H Kosiorek, T B Daniels, S E Schild, W G Rule, S A Vora, J B Ashman
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
R Fega, G P Fletcher, J L Peterson, M R Waddle, D M Barrs, J B Ashman, B R Bendok, N P Patel, S A Vora
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
I S Lyubutin, S S Starchikov, N E Gervits, Chun-Rong Lin, Yaw-Teng Tseng, Kun-Yauh Shih, Jiann-Shing Lee, Yu L Ogarkova, N Yu Korotkov
The combustion method was used to prepare a precursor powder of an iron-gallium oxide compound which was further heat-treated in order to obtain a set of Fe1+xGa2-xO4 nanoparticles. All samples have a cubic spinel-type structure (space group Fd3[combining macron]m) and the particle size varies from 1.8 to 28.0 nm depending on the treatment conditions. From the comparative analysis by XRD, EDS, and Raman and Mössbauer spectroscopy the creation of a new spinel phase γ-FeGaO3, which was mainly located on the particle surface, was established...
August 10, 2016: Physical Chemistry Chemical Physics: PCCP
Hasnain Ahmad, Jayasimha Atulasimha, Supriyo Bandyopadhyay
We report reversible strain-induced magnetization switching between two stable/metastable states in ~300 nm sized FeGa nanomagnets delineated on a piezoelectric PMN-PT substrate. Voltage of one polarity applied across the substrate generates compressive strain in a nanomagnet and switches its magnetization to one state, while voltage of the opposite polarity generates tensile strain and switches the magnetization back to the original state. The two states can encode the two binary bits, and, using the right voltage polarity, one can write either bit deterministically...
2015: Scientific Reports
Hasnain Ahmad, Jayasimha Atulasimha, Supriyo Bandyopadhyay
We report observation of a 'non-volatile' converse magneto-electric effect in elliptical FeGa nanomagnets delineated on a piezoelectric PMN-PT substrate. The nanomagnets are first magnetized with a magnetic field directed along their nominal major axes. Subsequent application of a strong electric field across the piezoelectric substrate generates strain in the substrate, which is partially transferred to the nanomagnets and rotates the magnetizations of some of them away from their initial orientations. The rotated magnetizations remain in their new orientations after the field is removed, resulting in 'non-volatility'...
October 9, 2015: Nanotechnology
Yan Yan, Elisa Ricci, Ramanathan Subramanian, Gaowen Liu, Oswald Lanz, Nicu Sebe
Recently, head pose estimation (HPE) from low-resolution surveillance data has gained in importance. However, monocular and multi-view HPE approaches still work poorly under target motion, as facial appearance distorts owing to camera perspective and scale changes when a person moves around. To this end, we propose FEGA-MTL, a novel framework based on Multi-Task Learning (MTL) for classifying the head pose of a person who moves freely in an environment monitored by multiple, large field-of-view surveillance cameras...
June 2016: IEEE Transactions on Pattern Analysis and Machine Intelligence
K Rebecca Fega, Gregory A Abel, Gabriela Motyckova, Alexander E Sherman, Daniel J DeAngelo, David P Steensma, Ilene Galinsky, Martha Wadleigh, Richard M Stone, Jane A Driver
OBJECTIVES: The International Prognostic Scoring System (IPSS) is commonly used to predict survival and assign treatment for the myelodysplastic syndromes (MDS). We explored whether self-reported and readily available non-hematologic predictors of survival add independent prognostic information to the IPSS. MATERIALS AND METHODS: Retrospective cohort study of consecutive MDS patients ≥age 65 who presented to Dana-Farber Cancer Institute between 2006 and 2011 and completed a baseline quality of life questionnaire...
July 2015: Journal of Geriatric Oncology
Alec Kirkeminde, Shenqiang Ren
Metal nanoalloys have rapidly grown in importance due to their higher surface area and unique nanosized properties. The metal-redox methodology is used and expanded upon utilizing FeGa as a model system. It is shown to control the stoichiometry and size of magnetic FeGa nanoalloy composites for the first time.
May 21, 2015: Chemical Communications: Chem Comm
Yiwei Liu, Qingfeng Zhan, Guohong Dai, Xiaoshan Zhang, Baomin Wang, Gang Liu, Zhenghu Zuo, Xin Rong, Huali Yang, Xiaojian Zhu, Yali Xie, Bin Chen, Run-Wei Li
Thermal and electrical control of magnetic anisotropy were investigated in flexible Fe81Ga19 (FeGa)/Polyvinylidene fluoride (PVDF) multiferroic heterostructures. Due to the large anisotropic thermal deformation of PVDF (α1 = -13 × 10(-6) K(-1) and α2 = -145 × 10(-6) K(-1)), the in-plane uniaxial magnetic anisotropy (UMA) of FeGa can be reoriented 90° by changing the temperature across 295 K where the films are magnetically isotropic. Thus, the magnetization of FeGa can be reversed by the thermal cycling between 280 and 320 K under a constant magnetic field lower than coercivity...
2014: Scientific Reports
S J Geetha, Sanket J Joshi
Under field conditions, inoculated rhizobial strains are at a survival disadvantage as compared to indigenous strains. In order to out-compete native rhizobia it is not only important to develop strong nodulation efficiency but also increase their competence in the soil and rhizosphere. Competitive survival of the inoculated strain may be improved by employing strain selection and by genetic engineering of superior nitrogen fixing strains. Iron sufficiency is an important factor determining the survival and nodulation by rhizobia in soil...
2013: TheScientificWorldJournal
Blake M Rankin, Michael D Hands, David S Wilcox, K Rebecca Fega, Lyudmila V Slipchenko, Dor Ben-Amotz
Interactions between halide ions (fluoride and iodide) and t-butyl alcohol (TBA) dissolved in water are probed using a recently developed hydration-shell spectroscopic technique and theoretical cluster and liquid calculations. High ignal-to-noise Raman spectroscopic measurements are combined with multivariate curve resolution (Raman-MCR) to reveal that while there is little interaction between aqueous fluoride ions and TBA, iodide ions break down the tetrahedral hydration-shell structure of TBA and produce a red-shift in its CH stretch frequency, in good agreement with the theoretical effective fragment potential (EFP) molecular dynamics simulations and hybrid quantum/EFP frequency calculations...
2013: Faraday Discussions
Alexander E Sherman, Gabriela Motyckova, K Rebecca Fega, Daniel J Deangelo, Gregory A Abel, David Steensma, Martha Wadleigh, Richard M Stone, Jane A Driver
We explored whether geriatric assessment variables predicted mortality in addition to known prognostic factors in 101 patients aged ≥ 65 with newly diagnosed AML. Baseline comorbidity score (HR=1.92; 95%CI 1.18-3.11), difficulty with strenuous activity (HR=2.18; 95%CI 1.19-4.00), and pain (HR=2.17; 95%CI 1.19-3.97) were independent prognostic factors for greater risk of death in a multivariable model that included cytogenetic risk group. They remained independent predictors in the subset of patients with baseline ECOG PS 0-1...
September 2013: Leukemia Research
Munima B Sahariah, Subhradip Ghosh, Chabungbam S Singh, S Gowtham, Ravindra Pandey
The structural stabilities, elastic, electronic and magnetic properties of the Heusler-type shape memory alloy Ni(2)FeGa are calculated using density functional theory. The volume conserving tetragonal distortion of the austenite Ni(2)FeGa find an energy minimum at c/a = 1.33. Metastable behaviour of the high temperature cubic austenite phase is predicted due to elastic softening in the [110] direction. Calculations of the total and partial magnetic moments show a dominant contribution from Fe atoms of the alloy...
January 16, 2013: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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