Scalable amplification with a high gain x energy product at room temperature using a thick slab of Yb3+:YAG

2020 ◽  
Author(s):  
Alain Jolly ◽  
Johan Boullet ◽  
Guillaume Machinet
Keyword(s):  
Room Temperature ◽  
High Gain ◽  
Thick Slab ◽  
Energy Product

Low-Temperature Magnetic Hysteresis in Nd(Pr)-Fe-B Nanostructured Alloys with Nd2Fe14B Type Main Phase Composition

2018 ◽  
Vol 386 ◽  
pp. 125-130 ◽  
Author(s):  
Dmitriy Sergeevich Neznakhin ◽  
Galina Aleksandrovna Politova ◽  
Lev Aleksandrovich Ivanov ◽  
Aleksey Sergeevich Volegov ◽  
Denis Ivanovich Gorbunov ◽  
...  
Keyword(s):  
Room Temperature ◽  
Magnetic Energy ◽  
Magnetic Phase ◽  
Magnetic Hysteresis ◽  
Nanostructured Alloys ◽  
Grain Sizes ◽  
Energy Product ◽  
Magnetization Saturation ◽  
Average Grain Size ◽  
Hysteresis Properties

Magnetic hysteresis properties of nanostructured industrially manufactured Nd-Fe-B and Pr-Fe-B alloys on the base of a tetragonal Nd2Fe14B (2-14-1) hard magnetic phase (MQP-B, MQP-B+ and MQP-16-7 brands) have been investigated at 4.2 K in magnetic fields up to 58 T. The chemical composition of the alloys given in the certificates was defined more precisely. The grain sizes of the main 2-14-1 phase were determined. The average grain size is much smaller than a critical single domain diameter. Coercivity, remanence magnetization, saturation magnetization and maximal magnetic energy product were determined at 4.2 K and compared with those obtained at room temperature.

Magnetic Properties of Some Hydrated Transition Metal Oxide and Hydroxide Nanoparticles Synthesized in Different Media

2010 ◽  
Vol 123-125 ◽  
pp. 727-730 ◽  
Author(s):  
Abdulaziz A. Bagabas ◽  
Khalil A. Ziq ◽  
Ahmad F. Salem ◽  
Emad S. Addurihem
Keyword(s):  
Particle Size ◽  
Transition Metal ◽  
Room Temperature ◽  
Permanent Magnets ◽  
Cost Effective ◽  
Precipitation Method ◽  
Energy Product ◽  
Wide Range ◽  
Precipitation Medium ◽  
And Performance

Nanoscale particle size of metal oxides and hydroxides showed enhanced various physical properties and performance. We established a simple, cost-effective, room-temperature (RT) precipitation method for the preparation of the magnetic, first-raw transition metal (TM) hydrated oxide and hydroxide nanoparticles. This method is based on the use of the TM nitrate, as the metal source, and cyclohexylamine (CHA), as a precipitating agent, either in the water (H2O) or ethanol (EtOH) medium. We found that the precipitation medium and the identity of precipitated TM strongly affect the morphology, particle size, and magnetism of the product. The morphology varies from spherical, to rectangular, to rod shape; while the size varies in the range of 5-30 nm. All samples showed paramagnetic behavior with Curie temperatures span over a wide range (20-150K). Huge hysteresis looses has been observed for manganese (Mn) sample, prepared in H2O. The coercively (Hc) at 4.2K for this sample is about 1.5T, which is comparable to the strongest permanent magnets (Nd-based magnets) available at room temperature. The energy product (Hc*MR) is about 4.5*105 (emu/g)Oe.

Broad-band high-gain room temperature photodetectors using semiconductor–metal nanofloret hybrids with wide plasmonic response

Nanoscale ◽  
2019 ◽  
Vol 11 (13) ◽  
pp. 6368-6376 ◽  
Author(s):  
Amir Ziv ◽  
Avra Tzaguy ◽  
Zhiyuan Sun ◽  
Shira Yochelis ◽  
Emmanuel Stratakis ◽  
...  
Keyword(s):  
Room Temperature ◽  
Broad Band ◽  
Optoelectronic Device ◽  
High Gain ◽  
Spectral Detection

We present an optoelectronic device for broad spectral detection using SiGe nanowires coupled to a plasmonic antenna.

Fabrication and Characterization of Bonded NdFeB Microstructures for Microelectromechanical Systems Applications

2011 ◽  
Vol 211-212 ◽  
pp. 561-564 ◽  
Author(s):  
Kai Tao ◽  
Gui Fu Ding ◽  
Zhuo Qing Yang ◽  
Yan Wang ◽  
Pei Hong Wang
Keyword(s):  
Room Temperature ◽  
Microelectromechanical Systems ◽  
Steel Substrate ◽  
Metal Mold ◽  
Promising Candidate ◽  
Energy Product ◽  
Micro Patterning ◽  
Fabrication And Characterization ◽  
Bonded Magnet

A micromachining technique has been developed for the fabrication of microscale polymer-bonded magnet. Two types of lithographically defined molds, photoresist mold and electroplated metal mold, were introduced. Photoresist mold is convenient, while electroplated metal mold can be fabricated on the glass or steel substrate which can bear much more compression. NdFeB films of thickness between 50 and 500 µm were prepared by micro-patterning of composites containing 83-95wt% of commercial NdFeB powder after curing at the room temperature. Magnetic properties mainly depend on the types and percentage of volume loading of magnetic powder. Coercivity of 772.4kA/m (9.70kOe), remanence of 275.1mT (2.751kG), and energy product of 22.6kJ/m3 (2.8MGOe) have been achieved. This easily developed magnet could be a promising candidate for applications in magnetic microelectromechanical systems (MEMS).

A photon detector with very high gain at low bias and at room temperature

2007 ◽  
Vol 91 (17) ◽  
pp. 171112 ◽  
Author(s):  
Omer Gokalp Memis ◽  
Alex Katsnelson ◽  
Soon-Cheol Kong ◽  
Hooman Mohseni ◽  
Minjun Yan ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Gain ◽  
Photon Detector ◽  
Very High

scholarly journals MnBi Magnetic Material: A Critical Review

2019 ◽  
Vol 29 (4) ◽  
pp. 441
Author(s):  
Nguyen Van Vuong
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
Magnetocrystalline Anisotropy ◽  
Ferromagnetic Material ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
The Past ◽  
Energy Product ◽  
The Look ◽  
Manganese Bismuth

Manganese Bismuth (MnBi) - the ferromagnetic material attracting a great interest of the world magnetic society last years. The absence of rare-earth elements in compositions, the sizable magnetocrystalline anisotropy, the room-temperature moderate but high-temperature reasonable magnetization plus the positive temperature coefficient of coercivity and the moderate Curie temperature make MnBi bulk magnets very potential for high-temperature magnet application. This bright future is a little gray because the research results in the past were not as expected. The paper summarizes the results concerning the MnBi alloys, powders and bulk magnets investigated during past 67 years. The look on the difficulties inhibiting the development of this material is given and the proposals that might allow overcoming the difficulties and push again the efforts of research towards the goal of 12 MGOe for the energy product (BH)max of MnBi bulk magnets are discussed.

In situ non-aqueous nucleation and growth of next generation rare-earth-free permanent magnets

2015 ◽  
Vol 17 (2) ◽  
pp. 1070-1076 ◽  
Author(s):  
Hyojung Yoon ◽  
Aoran Xu ◽  
George E. Sterbinsky ◽  
Dario A. Arena ◽  
Ziying Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Room Temperature ◽  
Permanent Magnets ◽  
Bulk Material ◽  
Nucleation And Growth ◽  
Time Resolved ◽  
Energy Product ◽  
Formation Kinetics ◽  
Kinetics Of

In situ time resolved XAS measurements are applied to investigate the phase formation kinetics of metastable cobalt carbide nanoparticles using polyol reduction chemistry. The resulting material exhibits an energy product of greater than 20.7 kJ m−3 at room temperature before compaction, a vastly improved coercivity compared to pure bulk material.

Room‐Temperature High‐Gain Long‐Wavelength Photodetector via Optical–Electrical Controlling of Hot Carriers in Graphene

2018 ◽  
Vol 6 (24) ◽  
pp. 1800836 ◽  
Author(s):  
Changlong Liu ◽  
Lin Wang ◽  
Xiaoshuang Chen ◽  
Antonio Politano ◽  
Dacheng Wei ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Gain ◽  
Hot Carriers ◽  
Long Wavelength
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