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Field-dependent spin waves in high-aspect-ratio singlecrystal ferromagnetic nanowires

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Nano Research 2016年第5期9卷 1426-1433页

作者： Semanti Pal Susmita Saha m. venkata kamalakar Anjan Barman Department of Condensed matter Physics and material Sciences S. N. Bose National Centre for Basic Sciences Block JD Sector Ⅲ Salt Lake Kolkata 700 098 India Department of Physics and Astronomy Uppsala University Box 516 75120 Uppsala Sweden

We investigate the spin wave （SW） modes in high-aspect-ratio single-crystal ferromagnetic nanowires （FmNWs） using an all-optical time-resolved magnetooptical Kerr effect （TR-mOKE） microscope. The precessional magnetization dynamics in such FmNWs unveil the presence of uniform and quantized SW modes that can be tuned by varying the bias magnetic field （H）. The frequencies of the modes are observed to decrease systematically with a decreasing magnetic field, and the number of modes in the spectrum is reduced from four to three for H 〈 0.7 kOe. To understand these results, we perform micromagnetic simulations that reveal the presence of edge, standing wave, and uniform SW modes in the nanowires （NWs）. Our simulations clearly show how the standing wave and uniform SW modes coalesce to form a single mode with uniform precession over the entire NW for H 〈 0.7 kOe, reproducing the experimentally observed reduction in modes. Our study elucidates the possibility of manipulating the SW modes in magnetic nanostructures, which is useful for applications in magnonic and spintronic devices.

关键词： Spin Wave Bias Field Ferromagnetic Resonance magnetization Dynamic Uniform mode

Tunnel magnetoresistance with atomically thin two- dimensional hexagonal boron nitride barriers

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Nano Research 2015年第4期8卷 1357-1364页

作者： Andre Dankert m. venkata kamalakar Abdul Wajid R. S. Patel Saroj P. Dash Department of microtechnology and Nanoscience Chalmers University of Technology SE-41296 Goteborg Sweden Department of Physics Birla Institute of Technology and Science Pilani--K K Birla Goa Campus Zuarinagar-403 726 Goa India

六角形的硼氮化物 h-BN 组成的二维的原子地薄的绝缘体在隧道的一个新范例基于设备。与它没有挂契约或接口陷井状态的原子地扁平的性质一起，大乐队差距在 spintronic 设备为隧道旋转运输使它成为一个理想的候选人。这里，我们通过化学... 详细信息

六角形的硼氮化物 h-BN 组成的二维的原子地薄的绝缘体在隧道的一个新范例基于设备。与它没有挂契约或接口陷井状态的原子地扁平的性质一起，大乐队差距在 spintronic 设备为隧道旋转运输使它成为一个理想的候选人。这里，我们通过化学蒸汽免职在磁性的隧道连接准备的大区域单层 h-BN 表明极化纺纱的电子的通道。在在薄片规模上制作的 ferromagnet/h-BN/ferromagnet heterostructures，我们在房间温度显示出隧道磁致电阻。在不同偏爱电压并且在有不同铁磁性的电极的多重设备上的大小建立旋转极化的通道使用 h-BN 障碍。这些结果为 2D 单层绝缘的集成打开方法在在周围的温度操作的活跃 spintronic 设备和电路的障碍，并且为他们的性质和前景的进一步的探索。

关键词：隧道磁阻六方氮化硼原子级二维自旋电子器件自旋极化电子化学气相沉积铁磁电极

CsF mediated rapid condensation of 1,3-cyclohexadione with aromatic aldehydes:Comparative study of conventional heating *** temperature

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Chinese Chemical Letters 2011年第7期22卷 777-780页

作者： kamalakar P.Nandre Vijay S.Patil Sidhanath V.Bhosale Department of Organic Chemistry North Maharashtra UniversityJalgaon 425 001India

A mild, efficient and high yielding protocol for the synthesis of 2,2＇-arylmethelene dicyclohexane- 1,3-dione derivatives at room temperature and 9-aryl-1,8-dihydrooctahydroxanthene at conventional heating using cesium fluoride as a catalyst is reported. The major advantages of this reaction are excellent yield, very short reaction time and use of inexpensive catalyst.

关键词： Aromatic aldehydes 1,3-Cyclohexadione Cesium fluoride

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镉取代对纳米镍铁氧体结构和磁性的影响

Chinese Journal of Chemical Physics 2010年第4期23卷 459-464,I0002页

作者： Sanjay Pralhadrao Jadhav Bhagwan Ghanshamji Toksha kamalakar marutirao Jadhav Shinde Dadarao Shinde Adarsh学院化学系:Omerga 奥兰加巴德431004 Babasaheb Ambedkar marathwada博士大学物理系奥兰加巴德431004 S.C.S学院化学系研究生部与研究中心 Omerga413606

采用湿化学共沉淀法合成了Ni1-xCdxFe2O4（0≤x≤0．5）的混合铁氧体，利用X射线衍射对其结构和晶相进行表征．结果表明：随着镉Cd浓度的增加晶格参数逐渐增大．扫描电子显微镜研究微观结构，TG／DTA研究了硫酸共沉淀物．揭示了在650℃... 详细信息

采用湿化学共沉淀法合成了Ni1-xCdxFe2O4（0≤x≤0．5）的混合铁氧体，利用X射线衍射对其结构和晶相进行表征．结果表明：随着镉Cd浓度的增加晶格参数逐渐增大．扫描电子显微镜研究微观结构，TG／DTA研究了硫酸共沉淀物．揭示了在650℃合成铁氧体同时进行分解．测量了纳米粒子的磁化强度和交流磁化率．结果表明，Ni1-xCdxFe2O4混合铁氧体的磁化率、居里温度和有效磁矩随着镉含量的增加下降。

关键词：铁氧体结构特征磁性

Glycerol mediated synthesis of 5-substituted lH-tetrazole under catalyst free conditions

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Chinese Chemical Letters 2012年第2期23卷 161-164页

作者： kamalakar P.Nandre Jagdish K.Salunke Jitendra P.Nandre Vijay S.Patil Amul U.Borse Sidhanath V.Bhosale Department of Organic Chemistry North Maharashtra UniversityJalgaon 425001India School of Chemical Sciences North Maharashtra UniversityJalgaon 425001India

We have developed simple,cost effective and environmentally benign protocol for the synthesis of 5-substituted 1H-tetrazoles via[2,3]cycloaddition reaction from organic nitriles and sodium azide in glycerol under cata... 详细信息

关键词： 5-Substituted 1H-tetrazole [3+2]Cycloaddition Nitriles Glycerol Catalyst free

Proteinuria in Hypertensive Nephropathy: A Review

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Open Journal of Nephrology 2014年第2期4卷 92-99页

作者： Rishi Sharma Surineni kamalakar Ellen mcCarthy Timothy A. Fields Kamal Gupta Rajat Barua Virginia Savin Kansas City VA medical Center 4801 Linwood Boulevard Kansas City USA University of Kansas medical Center 3901 Rainbow Boulevard Kansas City USA

Hypertension defined as a systolic blood pressure of ≥140 and a diastolic blood pressure ≥90 is anextremely prevalent condition;and it is responsible for significant mortality and morbidity. NHANESdata from 2005-2006 found that nearly 30% of adult US population has HTN;and nearly 8% of the population has undiagnosed HTN. HBP mortality in 2008 was 61,005. Any mentioned mortality in 2008 was 347,689 (NHLBI tabulation of NCHS mortality data). more than 20% of patients with systemic hypertension have chronic renal insufficiency (NHANES). Hypertensive nephropathy is a leading cause of end-stage renal disease (ESRD) requiring dialysis or transplantation or leading to death. The incidence of hypertension is high but only a subset of hypertensive patients progress to frank renal failure. A subset of hypertensive patients develop proteinuria during the course of disease and manifest nephrotic syndrome. This syndrome includes marked proteinuria, edema, and low serum albumin. Neither the incidence nor the clinical significance of proteinuria in hypertension without diabetes is known. Progression to chronic renal failure in some patients is preceded by proteinuria as indicated on “dip-stick” analyses of random urine samples. It appears that proteinuria is likely to increase both prior to and during evident loss of glomerular filtration, but this clinical observation has never been formally confirmed. There is a need for large studies to answer these questions. We also need to focus on the roles that genetic and environmental factors play in development and progression of renal disease in the setting of hypertension and proteinuria.

关键词： Hypertension Nephropathy Proteinuria ESRD Genetics

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水解羽毛粉日粮中添加氨基酸对育肥猪的效果

畜牧产业 2009年第4期 60-60页

作者：刘冰 K.C.Divakala L.I.Chiba R.B.kamalakar S.P.Rodning E.G.Welles K.A.Cummins J.Swann F.Cespedes R.L.Payne

本研究探讨了在育肥猪日粮中完全用水解羽毛粉代替豆粕的可行性。45头小母猪和45头去势公猪(每栏3头小母猪或3头去势公猪,每栏平均体重57.8±0.8kg)随机分5组,每组6个重复,饲喂1号育肥猪日粮。每栏

关键词：氨基酸育肥猪水解羽毛粉