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排序方式: 共有143条查询结果,搜索用时 312 毫秒
121.
Leonard F. Henrichs Oscar Cespedes James Bennett Joachim Landers Soma Salamon Christian Heuser Thomas Hansen Tim Helbig Oliver Gutfleisch Doru C. Lupascu Heiko Wende Wolfgang Kleemann Andrew J. Bell 《Advanced functional materials》2016,26(13):2111-2121
Multiferroics are promising for sensor and memory applications, but despite all efforts invested in their research no single‐phase material displaying both ferroelectricity and large magnetization at room‐temperature has hitherto been reported. This situation has substantially been improved in the novel relaxor ferroelectric single‐phase (BiFe0.9Co0.1O3)0.4–(Bi1/2K1/2TiO3)0.6, where polar nanoregions (PNR) transform into static‐PNR as evidenced by piezoresponse force microscopy (PFM) and simultaneously enable congruent multiferroic clusters (MFC) to emerge from inherent strongly magnetic Bi(Fe,Co)O3 rich regions as verified by magnetic force microscopy (MFM) and secondary ion mass spectrometry. The material's exceptionally large Néel temperature TN = 670 ± 10 K, as found by neutron diffraction, is proposed to be a consequence of ferrimagnetic order in MFC. On these MFC, exceptionally large direct and converse magnetoelectric (ME) coupling coefficients, α ≈ 1.0 × 10?5 s m?1 at room‐temperature, are measured by PFM and MFM, respectively. It is expected that the non‐ergodic relaxor properties which are governed by the Bi1/2K1/2TiO3 component to play a vital role in the strong ME coupling, by providing an electrically and mechanically flexible environment to MFC. This new class of non‐ergodic relaxor multiferroics bears great potential for applications. Especially the prospect of a ME nanodot storage device seems appealing. 相似文献
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C. Heuser M. MarpeD. Diesing A. Wucher 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2011,269(11):1190-1194
The kinetic excitation of a solid surface by impact of energetic particles is investigated by means of internal electron emission across a buried metal-insulator-metal (MIM) tunnel junction. By bombarding the top metal surface of such a device with keV noble gas ions, internal emission yields were determined as a function of projectile impact energy and angle of incidence with respect to the surface normal. In order to understand the observed impact angle dependence, we apply a modified formalism originally published to describe external electron emission. As a result, we find that the measured data can be explained by assuming the spatial distribution of excited electrons propagating towards the buried oxide interface to be strongly influenced by the projectile impact angle. A simple ballistic model assuming excited electrons generated by direct collisions with the projectile to preferably propagate along the direction of the original projectile motion, while electrons excited by scattering from moving recoils propagate isotropically, appears to describe the observed experimental data quite well. 相似文献
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Certain ammonia synthesis conditions lead to nitriding of a relatively thin surface layer of low-alloyed “hydrogen-resistant” steels. For reasons of thermodynamic stability of carbides and nitrides this causes a modification of the first, releasing carbon which can effuse from the steel and can react with diffusing hydrogen to form methane. Depending on the level and the direction of the total component stresses, small separations of grains, parallel to the surface, or cracks across the wall may slowly develop. Thus, the Nelson diagram has only limited validity in the case of materials selection for NH3-containing synthesis gases. 相似文献
127.
M Harfenist DJ Heuser CT Joyner JF Batchelor HL White 《Canadian Metallurgical Quarterly》1996,39(9):1857-1863
Inhibition of monoamine oxidase A (MAO A) is believed to cause antidepressant and possibly antianxiety effects. The previous paper had developed structure-activity relationships (SAR) for in vitro MAO A inhibition by tricyclic N-arylamides. It is shown in this paper that the same in vitro SAR can be carried over to tricyclics whose potentially toxic amide function is replaced by an appropriately substituted imidazoline, a 1,2,4- or 1,3,4-oxadiazole, or an alkylated tetrazole moiety. Dialysis of the inhibitor from the enzyme was used as a measure of reversibility which correlates with a low ability to cause a blood pressure rise with ingested tyramine ("cheese effect"). 相似文献
128.
G. Heuser A. Scholl E. Bames und A. Bechre 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1915,29(3):141-143
Ohne Zusammenfassung 相似文献
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E. Dinslage G. Sonntag P. W. Neumann und G. Heuser 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1912,23(8):393-399
Ohne Zusammenfassung 相似文献