Projects per year
Personal profile
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
- 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. - Nano-criticality in small CoO particles -
Presented at: ECNS 2007 - European Conference on Neutron Scattering 2007, June 25-29, Lund, Sweden. - 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. - Magnetic Properties of Magnetite Nano-Particles Manufactured by Reverse Micelles -
Presented at: DFS 2006, DK. - Fit;o) - A Mössbauer Spectrum Fitting Program -
Presented at: DFS 2006, DK. - Neutron scattering investigations of the antiferromagnetic phase of YBCO nano-particles - Download
Presented at:- ICNS 2005, Aus, nov-dec 2005
- DFS 2005, DK
- 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. - 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
- 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 - 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.
Education/Academic qualification
Unknown, Master, Pædagogikum in Physics and Mathematics, Tårnby Gymnasium & HF / University of Sourthen Denmark
15 Aug 2012 → 1 Jun 2013
Award Date: 1 Jun 2013
PhD, Antiferromagnetism in YBCO and CoO Nanoparticles, University of Copenhagen
1 Nov 2004 → 18 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
Fingerprint
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Network
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Aquaculture related ocean numerical modelling
Simonsen, K., í Hjøllum, J. & Blaasvær, H. F. E.
1/09/19 → 31/08/22
Project: Research
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Nanocriticality in the magnetic phase transition of CoO nanoparticles
Kamminga, M. E., Birk, J. O., í Hjøllum, J., Jacobsen, H., Lass, J., Koch, T. L., Christensen, N. B., Niedermayer, C., Keller, L., Theil Kuhn, L., Ulrikkeholm, E. T., Brok, E., Frandsen, C. & Lefmann, K., 27 Feb 2023, In: Physical review B. 107, 6, 14 p.Research output: Contribution to journal › Article › peer-review
Open AccessFile1 Downloads (Pure) -
Endamáls-drivin verklig undirvísing í alisfrøði
í Hjøllum, J. & Bearden, I. G., 18 Nov 2022. 1 p.Research output: Contribution to conference › Poster
Open AccessFile1 Downloads (Pure) -
Nýggjur havmyndil fyri føroyskt sjóøki: feskvatnsdrivna rákið á Landgrunninum
Simonsen, K., í Hjøllum, J. & Blaasvær, H. F. E., 18 Nov 2022. 1 p.Translated title of the contribution :A new ocean model for the Faroe area : the freshwater driven circulation on the Faroe Shelf Research output: Contribution to conference › Poster
File3 Downloads (Pure) -
Nýggjur havmyndil fyri føroyskt sjóøki: Nólsoyarfjørður og Tórshavnar havn
Simonsen, K., í Hjøllum, J. & Blaasvær, H. F. E., 18 Nov 2022. 1 p.Translated title of the contribution :A new ocean model for the Faroe area : Nólsoyarfjørður and the harbour of Tórshavn Research output: Contribution to conference › Poster
File3 Downloads (Pure) -
Fit;o): A Mössbauer spectrum fitting program
í Hjøllum, J. & Madsen, M. B., 2 Dec 2009, In: arXiv.org. 0912.0449.Research output: Contribution to journal › Article
Open Access
Prizes
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PhD Supervisor Seminar
Harriet Hammer (Organiser), Eyðfinn Magnussen (Participant), Anna Sofía Veyhe (Participant), Erika Anne Hayfield (Participant), Jógvan í Lon Jacobsen (Participant), Erling Isholm (Participant), Hallbera West (Participant), Anni Djurhuus (Participant), Malan Marnersdóttir (Participant), Ragnheiður Bogadóttir (Participant), Jari í Hjøllum (Participant), Maria Skaalum Petersen (Participant), May-Britt Skoradal (Participant), Jens Christian Svabo Justinussen (Participant), Annika Helgadóttir Davidsen (Participant), Ingi Heinesen Højsted (Participant), Poul Fossdal Guttesen (Participant), Bárður Larsen (Participant), Ása Róin (Participant), Jónrit Halling (Participant), Marin Strøm (Participant), Knud Simonsen (Participant), Firouz Gaini (Participant), Kalpana Vijayavarathan - R (Participant), Erla Olsen (Participant), Andras Mortensen (Participant), Hans Ellefsen (Participant), Jákup Reinert Hansen (Participant) & Erland Viberg Joensen (Participant)
29 Nov 2022Activity: Participating in or organising an event › Organising a conference, workshop, ...
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Frá Marsgransking til Myndlan á Setrinum ella Optimering av spinstøðuorku í nanobitlum
Jari í Hjøllum (Speaker)
18 Nov 2022Activity: Talk or presentation › Oral presentation
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NVD 50 ár
Heðin Abrahamsen (Organiser), Marjun á Fríðriksmørk Berbisá (Organiser), Hans-Georg Beyer (Organiser), Hans Frank Ellefsen Blaasvær (Organiser), Sigurd Christiansen (Organiser), Anni Djurhuus (Organiser), Hannes Gislason (Organiser), Jónrit Halling (Organiser), Jari í Hjøllum (Organiser), Benadikt Joensen (Organiser), Hans Pauli Joensen (Organiser), Sunnvør K. í Kongsstovu (Organiser), Jóhannus Kristmundsson (Organiser), Eyðfinn Magnussen (Organiser), Svein-Ole Mikalsen (Organiser), Hilmar Simonsen (Organiser), Knud Simonsen (Organiser), Jákup Svøðstein (Organiser), Mortan Janusarson Thomsen (Organiser) & Qin Xin (Organiser)
18 Nov 2022Activity: Participating in or organising an event › Organising a conference, workshop, ...
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Myndil fyri rákið í føroysku firðunum og Landgrunninum
Knud Simonsen (Speaker), Jari í Hjøllum (Speaker) & Hans Frank Ellefsen Blaasvær (Speaker)
18 Nov 2022Activity: Talk or presentation › Oral presentation
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KT, Verkfrøði og Lívfrøði
Jari í Hjøllum (Speaker)
2 Nov 2022Activity: Talk or presentation › Invited talk