sputter facility for thin film deposition

Seminar in dieser Woche

Freitag 22.09.2023
Ort IFW Dresden D2E.27
Referent J. Ping Liu
Thema Magnetic Hardening in Low Dimensional Ferromagnets
How “hard” (coercive) a ferromagnet can be has been a puzzle for a century. Seven decades ago, William Fuller Brown offered his famous theorem to correlate coercivity with the magnetocrystalline anisotropy fields in ferromagnetic materials. However, the experimental coercivity values have been far below the calculated levels given by the theorem, which is called Brown’s Coercivity Paradox. Researchers have attempted to solve the paradox with sustained efforts; however, the paradox remains unsolved, and coercivity still cannot be predicted and calculated quantitatively by modeling.

Progress has been made in the past 20 years in understanding coercivity mechanisms in nanoscale low-dimensional ferromagnets. In fact, ferromagnetism is a size-dependent physical phenomenon, as revealed by theoretical studies. However, nanoscale ferromagnetic samples with controllable size and shape have been available only in recent times. By adopting newly developed salt-matrix annealing, surfactant-assisted milling, and improved hydrothermal and chemical solution techniques, we used a bottom-up approach to produce nanostructured magnets and have successfully synthesized monodisperse ferromagnetic Fe-Pt, Fe-Co and Sm-Co nanoparticles and Co nanowires with extraordinary properties, which are strongly size- and shape-dependent. A study on size-dependent Curie temperature of the L10 ferromagnetic nanoparticles with sizes down to 2 nm has experimentally proved a finite-size effect. A systematic study of nanowires with extremely high coercivity above their magnetocrystalline anisotropy fields has opened a door to the solution of Brown’s Paradox.

Eingeladen von Dr. Thomas George Woodcock
Kontakt Martina Javorka

Freitag 22.09.2023
Ort IFW Dresden B3E.26
Referent Yuan Yu
Thema The design of thermoelectrics by tailoring chemical bonds and structural defects
Thermoelectric materials can generate clean electricity by the scavenging of waste heat and realize precise spot cooling by applying current. The performance of thermoelectric materials is determined by the intrinsic chemical bonding mechanism and the extrinsic manipulation of structural defects, both affecting the transport of electrons and phonons. An unconventional chemical bonding mechanism, named metavalent bonding, has been demonstrated unique to the high thermoelectric performance of many chalcogenides. Besides, lattice defects such as impurity clusters, Cottrell atmospheres, and interfacial complexions provide other freedoms to tune the thermoelectric properties in addition to traditional manipulations of the defect's dimensionality and density. In this talk, I will introduce metavalent bonding, experimental methods to characterize bonding and nano-chemistry of defects, as well as the correlations between these features and thermoelectric response.

Eingeladen von Dr. Ran He
Kontakt Martina Javorka

Freitag 22.09.2023
IMW-PhD Seminar 13:00
Ort IFW Dresden B3E.26
Referent Abhijith Payattuvalappil
Thema A Novel Approach for the Detection of Chemical Order on a Local Scale in L10 Structures
Eingeladen von Prof. Kornelius Nielsch
Kontakt Dr. Anke Kirchner

Seminare in der nächsten Woche

Dresden Science Calendar

Der Dresdner Wissenschaftskalender unterstützt die interdisziplinäre Forschung in Dresden durch das Sammeln, Strukturieren und Verteilen von Ankündigungen anstehender wissenschaftlicher Gespräche über eine einheitliche Internetplattform. Es ermöglicht jedem, alle Seminarankündigungen zu durchsuchen und gefilterte Informationen zu abonnieren.
Zum Dresden Science Calendar

Konferenzen und Workshops

Hier finden Sie eine Übersicht unserer wissenschaftlichen Veranstaltungen:

15. - 22. SeptemberSummer School Spectroelectrochemistry, IFW Dresden
17. - 23. SeptemberWorkshop "Magnetic Resonance of Correlated Electron Materials", IFW Dresden
21. - 22. SeptemberSAW Symposium 2023, Dresden
30. Nov. - 1. Dez.Joint Workshop IFW Dresden – University of Genoa „Superconducting and Topological Materials“, IFW Dresden
6. - 7. Oktober

Treffen des Arbeitskreises „Intermetallische und oxidische Systeme mit Spin- und Ladungskorrelation“ der Deutschen Gesellschaft für Kristallwachstum und Kristallzüchtung e. V.

4. - 5. OktoberKick-off Meeting THERMOS "Tellurium-Free Thermoelectric Modules by Interface Engineering", IFW Dresden
26. - 27.  Sept.19. GDS-Anwendertreffen, IFW Dresden (Flyer PDF)
30. Aug. - 1. Sept.Joint Workshop IFW Dresden – S.N. Bose National Center for Basic Sciences „Novel Magnetic and Topological Quantum Materials“ (Program PDF)
29. Aug. - 2. Sept.BIOREMIA Summer School, Ioannina / Griechenland
28. JuniNetzwerktreffen Additive-Drahtbasierte Fertigung: WirePrint // VEMAS-Anwenderworkshop, IFW Dresden
1. JuniUKRAPRO-Workshop: Condensed matter science assisted by machine learning, IFW Dresden
31. Mai4. UKRATOP Workshop: Topological Phenomena in Quantum Materials, IFW Dresden
06. - 07. AprilMeeting Projekt "Sound of Ice", IFW Dresden
14. - 15. OktoberSAW Symposium
14. OktoberAbschiedskolloquium für Prof. Dr. Oliver G. Schmidt
10. - 14. OktoberBIOREMIA-Workshop "Science Communication and Presentation Skills", Dresden
13. - 14. SeptemberInternationale Konferenz: "Frustrated Magnetism and Topology", IFW Dresden
25. - 27. MaiNature-Konferenz: Microrobots and Nanorobots for Biotechnology, online
26. März3. UKRATOP-Workshop, online
7. - 11. DezemberBeMagic Training Workshop für Doktoranden des EU-Projekts BeMagic, online
15. - 16. OktoberSAW Symposium 2020 (verschoben auf Herbst 2020)
29. Juni - 1. JuliUKRATOP Days mit Vorträgen der Stipendiaten, virtuellen Labtours in ukrainischer Sprache und online- Workshop zu Topologischen Quantenmaterialien, IFW Dresden
2. - 5. Juninature Konferenz: Microrobots & nanorobots for biotechnology, AGUV Akademie Dresden (verschoben: 25. - 27. Mai 2021)
15. - 20. MärzDPG-Frühjahrstagung, Dresden (abgesagt)
10. - 11. FebruarSächsischer Forschungs- und Vernetzungs-Workshop »Thermoelektrische Anwendungen in der Industrie«, Dorint Parkhotel Meißen

23. - 24. Januar

BIOREMIA Kick-off Meeting , IFW Dresden
25. - 27. SeptemberAnnual IFW Summer School for PhD students in Szczecin, Polan

15. - 20. September

ECASIA19: 18th European Conference on Applications of Surface and Interface Analysis

13. - 20. September

Summer School Spectroelectrochemistry, IFW Dresden
20. - 21. MaiInternational Workshop "Topology meets materials – Weizmann meets Dresden", IFW Dresden
28. - 29. März

International Workshop "Quantum Dynamics, Transport, and Exotic Orders: Strolling among Spins and Strong Correlations", IFW Dresden

28. - 29. MärzJoint workshop of BAM Berlin and IFW Dresden, IFW Dresden

4. - 5. Dezember

UKRATOP Workshop, IFW Dresden

1. - 2. Oktober

SAW Symposium, Westin Bellevue Dresden, Germany

28. - 30. AugustSpin, waves & interactions 2018, Greifswald, Germany

8. - 11. April

667. WE-Heraeus-Seminar on System-oriented approach to thermoelectrics: Materials – Interfaces – Devices in Bad Honnef, Germany

11. - 16. März

Joint Conference of the Condensed Matter Divisions of the DPG and EPS,

  • Session "Geometry and Topology-Controlled Nanoarchitectures", organized by Prof. Dr. V. Fomin, IFW Dresden
  • Symposium “Topology in Condensed Matter Physics (SYTO)”, co-organizer Prof. Dr. Jeroen van den Brink, IFW Dresden
  • Symposium “Voltage Control of Functional Interfaces: Magneto-ionic Meet Memristive Systems (SYVC)”, Co-organizer Dr. Karin Leistner, IFW Dresden

1. Februar

Workshop of the DFG Priority Programme 1458 “High Temperature Superconductivity in Iron Pnictides“, IFW Dresden

29. - 31. Januar

EPSQMat 2018: International Workshop on Electron and photon spectroscopies of quantum materials: status and perspectives, IFW Dresden