Cogent Physics最新文献_第6页

Electric field-controlled magnetization switching in Co/Pt thin-film ferromagnets Co/Pt薄膜铁磁体的电场控制磁化开关

Cogent Physics Pub Date : 2015-11-11 DOI: 10.1080/23311940.2016.1139435

A. Siddique, Shuo Gu, R. Witte, M. Ghahremani, Chidubem A. Nwokoye, A. Aslani, R. Kruk, V. Provenzano, L. H. Bennett, E. Torre

引用次数: 0

Magnetic states stabilization in Ni51Mn33.4In15.6 Heusler alloy Ni51Mn33.4In15.6 Heusler合金的磁态稳定

Cogent Physics Pub Date : 2015-11-05 DOI: 10.1080/23311940.2015.1109019

M. Ghahremani, A. Aslani, H. Elbidweihy, L. H. Bennett, E. Torre

{"title":"Magnetic states stabilization in Ni51Mn33.4In15.6 Heusler alloy","authors":"M. Ghahremani, A. Aslani, H. Elbidweihy, L. H. Bennett, E. Torre","doi":"10.1080/23311940.2015.1109019","DOIUrl":"https://doi.org/10.1080/23311940.2015.1109019","url":null,"abstract":"Abstract The rate-independent stabilization of magnetic states with iterations in a Heusler alloy has been studied. The direct measurement of the adiabatic temperature change, ΔTad, of a Ni51Mn33.4In15.6 alloy near the magnetostructural phase transition is presented. The adiabatic temperature change at a given temperature within the temperature range of the magnetostructural transition is history dependent and varies considerably with the iteration count of the field cycle. The data show the transition from the low magnetization state to the high magnetization state during low to high (L–H) temperature change direction and from high magnetization to low magnetization state during high to low (H–L) temperature change direction require several field cycles to stabilize the ΔTad measurement, similar to the accommodation phenomenon in hysteretic materials. In the mixed magnetic state inside the first-order transition, both low and high magnetization portions of the alloy exist and it varies considerably with the induced fields. This original observation emphasizes that it is incorrect to assess the performance of a magnetic refrigeration system through a single measurement, and that achieving a stable, utilizable, adiabatic temperature change requires several field-induced transitions.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2015.1109019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60084306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optoelectronic characterization of Eu3+ doped MLa2O4 (M = Sr, Ca, Mg) nanophosphors for display devices 显示器件用Eu3+掺杂MLa2O4 (M = Sr, Ca, Mg)纳米荧光粉的光电特性研究

Cogent Physics Pub Date : 2015-10-29 DOI: 10.1080/23311940.2015.1104200

Devender Singh, Vijeta Tanwar, A. Samantilleke, P. S. Kadyan, I. Singh

{"title":"Optoelectronic characterization of Eu3+ doped MLa2O4 (M = Sr, Ca, Mg) nanophosphors for display devices","authors":"Devender Singh, Vijeta Tanwar, A. Samantilleke, P. S. Kadyan, I. Singh","doi":"10.1080/23311940.2015.1104200","DOIUrl":"https://doi.org/10.1080/23311940.2015.1104200","url":null,"abstract":"Abstract Eu3+ doped MLa2O4 (M = Mg, Ca, Sr) nanophosphors were synthesized by a rapid facile gel combustion route. Luminescence properties of these prepared nanophosphors were analyzed by their excitation and emission spectra. The excitation spectrum consisted of some peaks in the 350–410 nm range due to the f–f transitions. The emission spectra of prepared nanophosphors had transitions of Eu3+ ions i.e. 5D0 → 7F0 (580 nm), 5D0 → 7F1 (594–596 nm), 5D0 → 7F2 (614–618, 628–629 nm), and 5D0 → 7F3 (650–651 nm). The main emission peak was observed at 614–618 nm of 5D0→7F2 transitions of Eu3+ ions. The enhancement in optical properties was observed when materials were reheated at higher temperatures. The nanostructural morphology was confirmed with scanning as well as transmission electron microscopy. The prepared materials were having size in the range of 10–50 nm. X-ray powder diffraction (XRD) technique was used to determine the crystal structure and phase of the prepared phosphor materials. XRD measurements revealed that the crystallinity of MLa2O4 materials increased with increasing the sintering temperature. The prepared materials had bright red emitting optical properties that could be suitably applied in various display devices.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2015.1104200","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60084297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

B-factory searches for light scalars and other new states(i) b工厂搜索轻标量和其他新状态(i)

Cogent Physics Pub Date : 2015-09-23 DOI: 10.1080/23311940.2015.1074146

R. Barlow

引用次数: 0

High-pressure and high-temperature synthesis of rhenium carbide using rhenium and nanoscale amorphous two-dimensional carbon nitride1 利用铼和纳米尺度非晶二维氮化碳进行高压高温合成碳化铼1

Cogent Physics Pub Date : 2015-09-07 DOI: 10.1080/23311940.2015.1076702

Nozomu Yasui, M. Sougawa, M. Hirai, K. Yamamoto, T. Okada, D. Yamazaki, Y. Kojima, H. Ohfuji, S. Kunitsugu, K. Takarabe

{"title":"High-pressure and high-temperature synthesis of rhenium carbide using rhenium and nanoscale amorphous two-dimensional carbon nitride1","authors":"Nozomu Yasui, M. Sougawa, M. Hirai, K. Yamamoto, T. Okada, D. Yamazaki, Y. Kojima, H. Ohfuji, S. Kunitsugu, K. Takarabe","doi":"10.1080/23311940.2015.1076702","DOIUrl":"https://doi.org/10.1080/23311940.2015.1076702","url":null,"abstract":"Abstract Both Re2C and Re2N are ultra incompressible and have a bulk modulus of about 400 GPa. These materials are synthesized under high pressure and high temperature. The synthesis pressures are about 10 GPa or below for Re2C and 20–30 GPa for Re2N. If the synthesis pressure of Re2N was about 10 GPa or below, a large volume high-pressure cell like a multi-anvil apparatus can be used to synthesize Re2N. To realize this, a proper solid nitrogen source is needed instead of liquid or gas nitrogen. We used a precursor of a mixture of rhenium and home-made nanoscale amorphous two-dimensional carbon nitride as a solid nitrogen source. Consequently, the synthesis reaction produced Re2C but not Re2N. We characterized the synthesized Re2C by various techniques including high-pressure x-ray diffraction (XRD). The bulk modulus B0 of the synthesized Re2C under hydrostatic conditions was estimated to be 385.7 ± 18.0 GPa. This value is a little smaller than the previous data. When the pressure medium became non-hydrostatic, the peculiar compression behaviour occurred; the rate of broadening of XRD lines increased and the compression became negligible in the range of a few GPa. The reason for this peculiar behaviour is not known.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2015.1076702","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60084678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Structural, spectroscopic and energetic parameters of P-bearing species having astrophysical importance 具有天体物理学意义的含磷物质的结构、光谱和能量参数

Cogent Physics Pub Date : 2015-08-12 DOI: 10.1080/23311940.2015.1070661

Kevin Gooniah, Hanshika Jhurree, L. Rhyman, I. Alswaidan, H. Fun, R. Somanah, P. Ramasami

引用次数: 0

Search for dark matter with the ATLAS detector 用ATLAS探测器寻找暗物质

Cogent Physics Pub Date : 2015-07-17 DOI: 10.1080/23311940.2015.1058465

C. Clement

引用次数: 0

Ultrasonic studies on sodium-doped LaMnO3 perovskite material 钠掺杂LaMnO3钙钛矿材料的超声研究

Cogent Physics Pub Date : 2015-07-17 DOI: 10.1080/23311940.2015.1067344

M. Arunachalam, P. Thamilmaran, S. Sankarrajan, K. Sakthipandi