44 research outputs found
Quantifying orbital Rashba effect via harmonic Hall torque measurements in transition-metal|Cu|Oxide structures
Spin-orbit interaction (SOI) plays a pivotal role in the charge-to-spin
conversion mechanisms, notably the spin Hall effect involving spin-dependent
deflection of conduction electrons and the interfacial spin Rashba-Edelstein
effect. In recent developments, significant current-induced torques have been
predicted and observed in material systems featuring interfaces with light
elements \textit{i.e.} possessing a weak SOI. These findings challenge existing
mechanisms and point to the potential involvement of the orbital counterpart of
electrons, namely the orbital Hall and orbital Rashba effects. Here, we
establish, in Pt|Co|Cu|AlOx stacking, the comparable strength between the
orbital Rashba effect at the Cu|AlOx interface and the effective spin Hall
effect in Pt|Co. Subsequently, we investigate the thickness dependence of an
intermediate Pt layer in Co|Pt|Cu|CuOx, revealing the strong signature of the
orbital Rashba effect at the Cu|CuOx interface besides the well-identified Pt
intrinsic spin Hall effect. Leveraging such contribution from the orbital
Rashba effect, we show a twofold enhancement in the effective torques on Co
through harmonic Hall measurements. This result is corroborated by
complementary spin Hall magneto-resistance and THz spectroscopy experiments.
Our results unveil unexplored aspects of the electron's orbital degree of
freedom, offering an alternative avenue for magnetization manipulation in
spintronic devices with potential implications for energy-efficient and
environmentally friendly technologies using abundant and light elements.Comment: 11 pages, 5 figure
The Grizzly, February 12, 1982
Administration Keeping an Eye on Pledging • Housing System Under One Roof • Sororities Dance for Charity • UC College Bowl Impressive at Moravian • Comment: A Letter to Dr. Kane • USGA Notes • Legend Behind Lorelei • FCA Marathon for Special Olympics • Winterfest Tickets Available for Students • Forum on Rising Medical Costs • President\u27s Corner: The Biologist and the Poet • Concert Review: JT, Somehow Perfect; Cars, Shakin\u27 It Up • Vanities Auditions • Soft Core Culture • Frats Converge for Bid Day • Sports Briefs: W\u27s Swimming Gets Revenge; Aquabears Down Swarthmore; Dreamers and Jamas Undefeated • Matmen Run With Streak to Six • Women Crush Cabrini, 78-62 • Men\u27s B-Ball Takes Twohttps://digitalcommons.ursinus.edu/grizzlynews/1072/thumbnail.jp
The Grizzly, December 4, 1981
Dealing With Financial Pressure • EcBA Department Interviews for New Positions • Freshman Relates Pre-Collegiate Experiences in Japan • Union Evaluation Prompts Improvement • Campus-wide Planning Meeting Sets Competitive Goals for UC • Residents Fix Up Curtis Hall • Lucas Named To PaCIE • \u27Messiah\u27 Rehearsal Open to Public • Jarvis and Rutherford in Last Coffeehouse • Best Albums of 1981 • Senior Poet Honored Nationally • New Wrestlers Lead the Way • Girls B-Ball Prime for Opener • Baseball Team Has New Skipper • Men\u27s Swimmers Take Third Place • Hoopsters Off to Slow Start • Gymnasts Pleasing • Women\u27s Swim Team Prepares for Tough Schedule • Mike Fagan All-MAChttps://digitalcommons.ursinus.edu/grizzlynews/1069/thumbnail.jp
The Grizzly, February 25, 1983
USGA Plans Communication Revision • Foley, D\u27Alesio First Place Winners at Talent Show • College Union Holds Tenth Anniversary • Ritter Production Opens: Skin of Our Teeth • Mass is Popular: Newman Society Links U.C. • Small Heads Alcohol Committee • SPC Seeks Editors • Union Calendar • Grizzly Looks For New Business Manager • Winterfest 1983: International Desserts Festival Tonight • Winterfest Schedule • Letters to the Editor: Admissions Dean Corrects Errors; Hoop Club President Responds; Student Reacts Negatively • Social Life at Ursinus Should be Improved • In the Gates • Registrar Announces Pre-Registration • President\u27s Corner • Roving Reporter: Do You Think the New Alcohol Policy Proposed by the Administration was the Correct Way to Handle the Situations That Occurred on Campus? • Bears Drown Monarchs • Women\u27s Swimming Ends 10-1 • MAC Competition: Wrestlers Take Seventh • Gymnasts Move up a Rank • Lady Hoopsters Finish With Victoryhttps://digitalcommons.ursinus.edu/grizzlynews/1095/thumbnail.jp
The Grizzly, February 19, 1982
Union Victim of Apparent Vandalism • Bomberger to be Closed After Hours if Vandalism Continues • Foreign Language Career Day: Getting an Edge in Business • Arnold to Join Administration • Reagan: Friend of the Forces • Richter Urges Campus Involvement • Parents Notified of Possible Changes in Aid • Fraternities and Presidents • Meistersingers Begin Spring Concert Tour • English Department Considers Changes • News Briefs: Astronomer to Speak at Ursinus College; Winning Photographer to Conduct Courses at Ursinus College • Joan Jett at the Tower: I Don\u27t Care About a Bad Reputation • Winterfest 1982 • Pi Nu Epsilon: New Members Honored • UC Represents Bahrain in Model UN • USGA Notes • Aggies Buried by UC Women • Women Lose Thriller • Women\u27s Badminton • Sports Briefs: Aquabears Drop One to F&M; Men\u27s Intramural B-ball; Gymnasts Vault to Best Scores • Men\u27s Hoops Takes Two Out of Three • Grapplers Record Best in UC Historyhttps://digitalcommons.ursinus.edu/grizzlynews/1073/thumbnail.jp
Ultrafast spin-currents and charge conversion at \u3ci\u3e3d-5d\u3c/i\u3e interfaces probed by time-domain terahertz spectroscopy
Spintronic structures are extensively investigated for their spin-orbit torque properties, required for magnetic commutation functionalities. Current progress in these materials is dependent on the interface engineering for the optimization of spin transmission. Here, we advance the analysis of ultrafast spin-charge conversion phenomena at ferromagnetic-Transition metal interfaces due to their inverse spin-Hall effect properties. In particular, the intrinsic inverse spin-Hall effect of Pt-based systems and extrinsic inverse spin-Hall effect of Au:W and Au:Ta in NiFe/Au:(W,Ta) bilayers are investigated. The spin-charge conversion is probed by complementary techniques-ultrafast THz time-domain spectroscopy in the dynamic regime for THz pulse emission and ferromagnetic resonance spin-pumping measurements in the GHz regime in the steady state-to determine the role played by the material properties, resistivities, spin transmission at metallic interfaces, and spin-flip rates. These measurements show the correspondence between the THz time-domain spectroscopy and ferromagnetic spin-pumping for the different set of samples in term of the spin mixing conductance. The latter quantity is a critical parameter, determining the strength of the THz emission from spintronic interfaces. This is further supported by ab initio calculations, simulations, and analysis of the spin-diffusion and spin-relaxation of carriers within the multilayers in the time domain, permitting one to determine the main trends and the role of spin transmission at interfaces. This work illustrates that time-domain spectroscopy for spin-based THz emission is a powerful technique to probe spin-dynamics at active spintronic interfaces and to extract key material properties for spin-charge conversion
Exonic DNA Sequencing of ERBB4 in Bipolar Disorder
The Neuregulin-ErbB4 pathway plays a crucial role in brain development and
constitutes one of the most biologically plausible signaling pathways implicated
in schizophrenia and, to a lesser extent, in bipolar disorder (BP). However,
recent genome-wide association analyses have not provided evidence for common
variation in NRG1 or ERBB4 influencing
schizophrenia or bipolar disorder susceptibility. In this study, we investigate
the role of rare coding variants in ERBB4 in BP cases with
mood-incongruent psychotic features, a form of BP with arguably the greatest
phenotypic overlap with schizophrenia. We performed Sanger sequencing of all 28
exons in ERBB4, as well as part of the promoter and part of the
3′UTR sequence, hypothesizing that rare deleterious variants would be
found in 188 cases with mood-incongruent psychosis from the GAIN BP study. We
found 42 variants, of which 16 were novel, although none were non-synonymous or
clearly deleterious. One of the novel variants, present in 11.2% of
cases, is located next to an alternative stop codon, which is associated with a
shortened transcript of ERBB4 that is not translated. We
genotyped this variant in the GAIN BP case-control samples and found a
marginally significant association with mood-incongruent psychotic BP compared
with controls (additive model: OR = 1.64,
P-value = 0.055; dominant model:
OR = 1.73.
P-value = 0.039). In
conclusion, we found no rare variants of clear deleterious effect, but did
uncover a modestly associated novel variant that could affect alternative
splicing of ERBB4. However, the modest sample size in this
study cannot definitively rule out a role for rare variants in bipolar disorder
and studies with larger sample sizes are needed to confirm the observed
association
The Effect of Intra-Abdominal Hypertension Incorporating Severe Acute Pancreatitis in a Porcine Model
Introduction: Abdominal compartment syndrome (ACS) and intra abdominal hypertension(IAH) are common clinical findings in patients with severe acute pancreatitis(SAP). It is thought that an increased intra abdominal pressure(IAP) is associated with poor prognosis in SAP patients. But the detailed effect of IAH/ACS on different organ system is not clear. The aim of this study was to assess the effect of SAP combined with IAH on hemodynamics, systemic oxygenation, and organ damage in a 12 h lasting porcine model
Non specific acid esterase activity in human periapical inflammatory cells
Abstract
The fine structural localization of non specific acid alpha-naphthyl acetate esterase activity (ANAE) in human periapical inflammatory cells was studied in sections of paraffin embedded tissue of 20 human periapical lesions (granulomas). Examination of specimens incubated with ANAE resulted in ANAE+ cells interpreted as T-lymphocytes, monocytes, macrophages, giant cells and plasma cells. ANAE- lymphocytes were interpreted as B cells. Our findings do not seem to confirm the presence among human periapical inflammatory cells of NK (natural killer) cells. T-lymphocytes were the most represented cellular type. The macrophages with ANAE+ reaction were numerous in all specimens observed and the variation in staining intensity could reflect a varying stage of activation. These findings allow conclusions about the role of T-lymphocyte mediated immune reaction in the pathogenesis of periapical lesions. The possibility that the activated T-lymphocytes within the periapical lesions may have a critical role in establishing and maintaining granuloma formation is also discussed