Jari í Hjøllum

Jari í Hjøllum

Programme Director for Engineering & Marine Engineering, Oceanographic researcher at COSUrFI, Teaching Lecturer in Science, PhD

  • Vestara Bryggja 15, FO-100 Tórshavn

    Faroe Islands

20092024

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Personal profile

Personal profile

Jari í Hjøllum is staffed at the Faculty of Science and Technology as a teaching lecturer, and programme director of B.Sc in Engineering. He graduated from the Niels Bohr Institute as Cand. Scient. in Physics and Mathemathics in 2004. He was awarded his ph.d in Physics for his thesis "Antiferromagnetism in YBCO and CoO Nanoparticles" in 2007."

Publications

Talks

  • Frá Marsgransking til Myndlan á Setrinum ella Optimering av spinstøðuorku í nanobitlum. Jari í Hjøllum. NVD 50 ár. 18. Nov. 2022 Kongshøll, Fróðskaparsetur Føroya.
  • Endamáls-drivin verklig undirvísing í alisfrøði (Objective-based experiments in physics teaching). Jari í Hjøllum & Ian G. Bearden,Vísindavøka 2022, sep. 2022, Løkshøll.
  • Nano-criticality in small CoO particles. - Jari í Hjøllum, Jonas O. Birk, Kim Lefmann, Niels B. Christensen, Christof Niedermayer, Cathrine Frandsen. Danish Physical Society 2007.
  • Electron holography - Hovedfagskolloqium (en: Major Colloqium), Jari í Hjøllum. 2004. Supervisor: Erik Johnson, University of Copenhagen.

Papers

  • Nanocriticality in the magnetic phase transition of CoO nanoparticles. Machteld E. Kamminga, Jonas Okkels Birk, Jari í Hjøllum, Henrik Jacobsen, Jakob Lass, Thorbjørn L. Koch, Niels B. Christensen, Christof Niedermayer, Lukas Keller, Luise Theil Kuhn, Elisabeth T. Ulrikkeholm, Erik Brok, Cathrine Frandsen, Kim Lefmann.Phys. Rev. B, 107, 6, 064424, Feb. 2023. doi:10.1103/PhysRevB.107.064424
  • Overview of the magnetic properties experiments on the Mars Exploration Rovers. M. B. Madsen, W. Goetz, P. Bertelsen, C. S. Binau, F. Folkmann, H. P. Gunnlaugsson, J. í Hjøllum, S. F. Hviid, J. Jensen, K. M. Kinch, K. Leer, D. E. Madsen, J. Merrison, M. Olsen, H. M. Arneson, J. F. Bell III, R. Gellert, K. E. Herkenhoff,8 J. R. Johnson,8 M. J. Johnson,5 G. Klingelhöfer, E. McCartney, D. W. Ming, R. V. Morris, J. B. Proton, D. Rodionov, M. Sims, S. W. Squyres, T. Wdowiak and A. S. Yen. JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 114, 2009. doi:10.1029/2008JE003098.

  • Fit;o) - A Mössbauer spectrum fitting program. Jari í Hjøllum and Morten Bo Madsen. arXiv:0912.0449v1 (2009).

Workshops

  • Ian G. Bearden & Jari í Hjøllum. Building/using an DIY gamma detector. Danish Physical Society annual meeting 2018.
  • Ian G. Bearden & Jari í Hjøllum. Using the Raspberry Pi as an alpha particle detector. Danish Physical Society annual meeting 2017.

Posters

  1. Investigations of the Antiferromagnetic Order Parameter in Nano-Sized YBCO Particles -
    Presented at: ICNS2009 - International Conference on Neutron Scattering 2009, May 3-7, 2009, Knoxville, TN, USA.
  2. Nano-criticality in small CoO particles -
    Presented at: ECNS 2007 - European Conference on Neutron Scattering 2007, June 25-29, Lund, Sweden.
  3. Investigations of the antiferromagnetic phase of YBCO nano-particles -
    Presented at: First CoMePhS Workshop on PHASE SEPARATION IN ELECTRONIC SYSTEMS Crete - Greece, October 29 - November 4, 2006.
  4. Magnetic Properties of Magnetite Nano-Particles Manufactured by Reverse Micelles -
    Presented at: DFS 2006, DK.
  5. Fit;o) - A Mössbauer Spectrum Fitting Program -
    Presented at: DFS 2006, DK.
  6. Neutron scattering investigations of the antiferromagnetic phase of YBCO nano-particles - Download
    Presented at:
    • ICNS 2005, Aus, nov-dec 2005
    • DFS 2005, DK
  7. Water and magnetic properties of dust on Mars - Results from the Mars Exploration Rovers
    J. í Hjøllum, K. Leer, P. Bertelsen, M. B. Madsen.
    Presented at: DFS 2004, DK.
  8. Magnetic properties of iron oxide nano-particles fabricated by the inverse micellar method -
    Presented at:
    • Annual meeting of Danish Physical Society 2003, Nyborg, Denmark, May 2003.
    • International Conference on Magnetism, Rome, july 2003.
    • Risø international symposium on materials science, superconductivety and magnetism, Roskilde, august, 2003

Coauthored Posters

  1. K. Leer, J. í Hjollum, P. Bertelsen, W. Goetz, K. Kinch, S. F. Hviid, J.
    M. Knudsen, M. B. Madsen. Magnetic properties of dust on Mars - Results
    from the Mars Exploration Rovers, Presented at: American Geophysical
    Union, Fall Meeting 2004 link
  2. Andreasen, A., Vegge, T., Hjøllum, J. Í., Engberg, D., & Lefmann, K.
    (2004). A quasi-elastic neutron scattering study of H-motion in complex
    sodium aluminum hydride (poster). Poster session presented at 2nd Annual
    Meeting in the Copenhagen Graduate School for Nanoscience and Nanotechnology,
    Copenhagen, Denmark. link

Presentations:

  • KT, Verkfrøði & Lívfrøði – øki í vøkstri. Jari í Hjøllum. Framløga á Markleys Útbúgving 2022.

Teaching

  • External Associate Professor
    Niels Bohr Institute, University of Copenhagen
    Aug 2015 - Aug 2018
    • Teacher in FUF, Physics Teaching Experiments.
  •  Lektor in Physics & Mathematics
    Tårnby Gymnasium & HF
    Aug. 2011 - Jan. 2019
  • Adjunkt in Physics, Mathematics & Computer Science
    Frederiksbergs Tekniske Gymnasium - TEC

Research interests

  • Numerical Modelling
  • Numerical Simulation
  • Magnetic properties of iron oxide nano particles.
  • Magnetic properties of nano-sized HTC superconductors.
  • Mössbauer Spectroscopy.
  • Neutron Scattering / Diffraction.
  • Instrument / Measurement Software.

Expertise related to UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This person’s work contributes towards the following SDG(s):

  • SDG 13 - Climate Action
  • SDG 15 - Life on Land

Education/Academic qualification

Unknown, Master, Pædagogikum in Physics and Mathematics, Tårnby Gymnasium & HF / University of Sourthen Denmark

15 Aug 20121 Jun 2013

Award Date: 1 Jun 2013

PhD, Antiferromagnetism in YBCO and CoO Nanoparticles, University of Copenhagen

1 Nov 200418 Oct 2008

Award Date: 18 Oct 2008

Master, A Study of Iron Oxide Nano-particles Manufactured by Reverse Micelles, University of Copenhagen

… → Oct 2004

Award Date: 1 Oct 2004

Bachelor, Stable wustite, FeO, nano particles, manufacturing and magnetic properties, University of Copenhagen

… → Jun 2001

Award Date: 1 Jun 2001

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