MARC Record from marc_columbia

LEADER: 02740cam a22003493i 4500
001 11625117
005 20180618182829.0
006 m o d
007 cr |n||||a||||
008 151105s2015 nyu|||| om 00| ||eng d
035 $a(OCoLC)929921438
035 $a(OCoLC)ocn929921438
035 $a(NNC)ACfeed:legacy_id:ac:189664
035 $a(NNC)ACfeed:doi:10.7916/D8FN15NK
035 $a(NNC)11625117
040 $aNNC$beng$erda$cNNC
100 1 $aLi, Yi.
245 10 $aNovel torques on magnetization measured through ferromagnetic resonance /$cYi Li.
264 1 $a[New York, N.Y.?] :$b[publisher not identified],$c2015.
300 $a1 online resource.
336 $atext$btxt$2rdacontent
337 $acomputer$bc$2rdamedia
338 $aonline resource$bcr$2rdacarrier
502 $aThesis (Ph.D.)--Columbia University, 2015.
500 $aDepartment: Materials Science and Engineering.
500 $aThesis advisor: William E. Bailey.
520 $aNew torques acting on magnetization in metallic ferromagnets, accompanied by new terms to the Landau-Lifshitz-Gilbert (LLG) equation which governs GHz magnetization dynamics, are important for both the fundamental understanding of magnetism and applications in magnetoelectronic devices. In this thesis, we have carried out experimental investigations of several proposed novel torques acting on magnetization dynamics using broadband ferromagnetic resonance (FMR) between 2-26 GHz. The FMR technique is well-suited for materials studies, as it investigates unpatterned (sheet-level) films with relatively high throughput, enabling comparison of the response of several room-temperature, device-relevant ferromagnetic alloys (e.g. Ni₇₉Fe₂₁, or ‘Py’, Co, and CoFeB.) The common aspect of the torques which we have investigated by FMR is their origin in nonequilibrium spin populations, related to spin transfer torque. In Chapter 3 we have identified intrinsic “inertial” torques on magnetization, significant only at very high frequencies (up to 300 GHz), where the electron population cannot quite keep pace with the precession of magnetization.
520 $aIn Chapters 4 and 5 we have studied torques from “pumped” pure spin current due to the texture of precessing magnetization (intralayer spin pumping) and the precession of noncollinear magnetizations in trilayer structures (spin pumping). These three studies extend understanding of magnetism and magnetization dynamics at room temperature, and in limits of high speed and small dimension relevant for emerging applications.
653 0 $aMaterials science
653 0 $aCondensed matter
856 40 $uhttps://doi.org/10.7916/D8FN15NK$zClick for full text
852 8 $blweb$hDISSERTATIONS