All Scheduled Events, Physics | AS

June 27, 2019 Thursday 9:30 AM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Modjaz Group Mtg
Modjaz Group Mtg

July 1, 2019 Monday 2:00 PM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Blanton Tinker Pullen
Blanton Tinker Pullen

July 2, 2019 Tuesday 11:00 AM +
726 Broadway Room 1067
Condensed Matter Physics Seminars (cmp)

Daniel McNally
Associate Editor of Nature Materials

Nature Materials

Nature Materials offers authors high visibility for their work. A team of full-time, professional editors select and commission articles that represent a substantial and arresting fundamental, mechanistic, methodological or practical advance. In this talk I will convey the editor’s perspective on the life of a manuscript after submission to Nature Materials, and provide an overview of the types of content that we publish.

July 8, 2019 Monday 2:00 PM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Blanton Tinker Pullen
Blanton Tinker Pullen

July 11, 2019 Thursday 9:30 AM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Modjaz Group Mtg
Modjaz Group Mtg

July 12, 2019 Friday 11:00 AM +
726 Broadway Room 1067
Condensed Matter Physics Seminars (cmp)

Giovanni Finocchio
University of Messina

New directions for microwave and THz detectors based on spintronic diodes

Microwave detectors based on the spin-torque diode effect are among the key emerging spintronic devices. By utilizing the spin of electrons in addition to their charge, they have the potential to overcome the theoretical performance limits of their semiconductor (Schottky) counterparts. In the first part of the talk, I will discuss our recent results in the field of microwave detectors based on spin diodes.¹ Those devices realized with magnetic tunnel junctions exhibit high-detection sensitivity >200kV/W at room temperature, without any external bias fields, and for low-input power (micro-Watts or lower).² This sensitivity, achieved taking advantage of the injection locking, is significantly larger than both biased state- of-the-art-Schottky diode detectors and other existing spintronic diodes. Another application of spintronic diodes is the electromagnetic energy harvesting. Here I will show the development of a bias-field-free spin- torque diodes that could be an efficient harvester of broadband ambient RF radiation, capable to efficiently harvest microwave powers of microWatt and below and to power a black phosphorous nanodevice. Finally, the talk will discuss the promising directions of THz detectors based on antiferromagnetic materials including their unique properties such as resonance response and tunability and the remaining challenges to face.

1. Fang, B. et al. Giant spin-torque diode sensitivity in the absence of bias magnetic field. Nat. Commun. 7, (2016).
2. Zhang, L. et al. Ultrahigh detection sensitivity exceeding 10 ⁵ V/W in spin-torque diode. Appl. Phys. Lett. 113, 102401 (2018).
3. Fang, B. et al. Experimental Demonstration of Spintronic Broadband Microwave Detectors and Their Capability for Powering Nanodevices. Phys. Rev. Appl. 11, 1 (2019).

July 15, 2019 Monday 2:00 PM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Blanton Tinker Pullen
Blanton Tinker Pullen

July 16, 2019 Tuesday 11:00 AM +
726 Broadway Room 1067
CQP Seminars (cqp)

Tom Marshall
Bloomberg

TBD

July 18, 2019 Thursday 9:30 AM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Modjaz Group Mtg
Modjaz Group Mtg

July 22, 2019 Monday 2:00 PM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Blanton Tinker Pullen
Blanton Tinker Pullen

July 23, 2019 Tuesday 11:00 AM +
726 Broadway Room 1067
Condensed Matter Physics Seminars (cmp)

Charles Black
Brookhaven National Laboratory

TBD

July 25, 2019 Thursday 9:30 AM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Modjaz Group Mtg
Modjaz Group Mtg

July 25, 2019 Thursday 2:00 PM +
726 Broadway Room 1067
Condensed Matter Physics Seminars (cmp)

Olle Heinonen
Argonne National Laboratory

TBD

July 29, 2019 Monday 2:00 PM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Blanton Tinker Pullen
Blanton Tinker Pullen

August 1, 2019 Thursday 9:30 AM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Modjaz Group Mtg
Modjaz Group Mtg

August 5, 2019 Monday 2:00 PM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Blanton Tinker Pullen
Blanton Tinker Pullen

August 7, 2019 Wednesday 11:00 AM +
726 Broadway Room 1067
Condensed Matter Physics Seminars (cmp)

Zlatko Minev
IBM

TBD

August 8, 2019 Thursday 9:30 AM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Modjaz Group Mtg
Modjaz Group Mtg

August 12, 2019 Monday 2:00 PM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Blanton Tinker Pullen
Blanton Tinker Pullen

August 15, 2019 Thursday 9:30 AM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Modjaz Group Mtg
Modjaz Group Mtg

August 19, 2019 Monday 2:00 PM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Blanton Tinker Pullen
Blanton Tinker Pullen

August 20, 2019 Tuesday 11:00 AM +
726 Broadway Room 1067
CQP Seminars (cqp)

Kookrin Char
Seoul National University

TBD

August 22, 2019 Thursday 9:30 AM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Modjaz Group Mtg
Modjaz Group Mtg

August 26, 2019 Monday 2:00 PM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Blanton Tinker Pullen
Blanton Tinker Pullen

August 29, 2019 Thursday 9:30 AM +
726 Broadway, 901, Sm Conf
Other CCPP (ccpp)

Modjaz Group Mtg
Modjaz Group Mtg

September 6, 2019 Friday 10:00 AM +
726 Broadway, 940, CCPP Seminar
Other CCPP (ccpp)

CCPP-EPP New Student Sym
CCPP-EPP New Student Symposium
NYU

CCPP-EPP New Student Symposium

September 11, 2019 Wednesday 2:00 PM +
726 Broadway, 940, CCPP Seminar
High Energy Physics Seminars (hep)

Francesco Nitti
Universite Paris Diderot

September 13, 2019 Friday 9:00 AM +
726 Broadway CSMR/CQP
Other Physics Department Events (other)

Condensed Matter Physics Mini Symposium for Graduate Students (CSMR/CQP)

Schedule to TBD

September 17, 2019 Tuesday 11:00 AM +
726 Broadway Room 1067
Condensed Matter Physics Seminars (cmp)

Peter Fischer
Lawrence Berkeley National Laboratory

TBD

September 20, 2019 Friday 11:00 AM +
726 Broadway Room 1067
Condensed Matter Physics Seminars (cmp)

Justin Shaw
National Institute of Standards and Technology

Broadband Ferromagnetic Resonance Spectroscopy: The “Swiss Army Knife” for Understanding Spin-Orbit Phenomena

Modern spin-based technologies rely on multiple, simultaneous phenomena that originate from the spin-orbit interaction in magnetic systems. These include damping, magnetic anisotropy, orbital moments, and spin-orbit torques that are manifested in the spin-Hall and Rashba-Edelstein effects. While cavity based ferromagnetic resonance (FMR) spectroscopy has been used to characterize magnetic materials for many decades, recent advances in broadband and phase-sensitive FMR techniques have allowed further refinement, improved accuracy, and new measurement capability. In fact, broadband FMR techniques can now precisely measure spin-orbit torques at the thin-film level without the requirement of device fabrication [1].
Broadband FMR measurements have also improved our fundamental understanding of magnetic damping. Numerous extrinsic relaxation mechanisms can obscure the measurement of the intrinsic damping of a material. This created a challenge to our understanding of damping because experimental data were not always directly comparable to theory. As a result of the improved ability to quantify all of these relaxation mechanisms, many theoretical models have been refined. In fact, this has recently led to both the prediction [2] and discovery [3] of new materials with ultra- low magnetic damping that will be essential for future technologies based on spintronics, magnonics, spin-logic and high-frequency devices.
I will begin this lecture with a basic introduction to spin-orbit phenomena, followed by an overview of modern broadband FMR techniques and analysis methods. I will then discuss some recent successes in applying broadband FMR to improve our ability to control damping in metals and half-metals, quantify spin-orbit torques and spin- diffusion lengths in multilayers, and determine the interrelationships among damping, orbital moments, and magnetic anisotropy [4], [5]. The impact of these result on specific technologies will also be discussed.

[1] A. J. Berger, E. R. J. Edwards, H. T. Nembach, A. D. Karenowska, M. Weiler, and T. J. Silva, “Inductive detection of fieldlike and dampinglike ac inverse spin-orbit torques in ferromagnet/normal-metal bilayers,” Phys. Rev. B, vol. 97, 094407, Mar. 2018.
[2] S. Mankovsky, D. Ködderitzsch, G. Woltersdorf, and H. Ebert, “First-principles calculation of the Gilbert damping parameter via the linear response formalism with application to magnetic transition metals and alloys,” Phys. Rev. B, vol. 87, 014430, Jan. 2013.
[3] M. A. W. Schoen, D. Thonig, M. L. Schneider, T. J. Silva, H. T. Nembach, O. Eriksson, O. Karis, and J. M. Shaw, “Ultra-low magnetic damping of a metallic ferromagnet,” Nat. Phys., vol. 12, pp. 839–842, Sep. 2016.
[4] J. M. Shaw, H. T. Nembach, T. J. Silva, and C. T. Boone, “Precise determination of the spectroscopic g-factor by use of broadband ferromagnetic resonance spectroscopy,” J. Appl. Phys., vol. 114, 243906, Dec. 2013.
[5] J. M. Shaw, H. T. Nembach, and T. J. Silva, “Resolving the controversy of a possible relationship between perpendicular magnetic anisotropy and the magnetic damping parameter,” Appl. Phys. Lett., vol. 105, 062406, Aug. 2014.

November 6, 2019 Wednesday 2:00 PM +
726 Broadway, 940, CCPP Seminar
High Energy Physics Seminars (hep)

Sasha Penin
U. of Alberta

Magic and beauty of QCD at high energy

November 6, 2019 Wednesday 3:00 PM +
726 Broadway, room 871
Soft Condensed Matter Seminars (csmr)

Jean-Baptiste Masson
Institut Pasteur

TBA

December 11, 2019 Wednesday 3:00 PM +
726 Broadway, room 871
Soft Condensed Matter Seminars (csmr)

Sujit S. Datta
Princeton University

TBA