About Us & Publications

XMCD Graphene

The group is equipped to characterise and fabricate nanomagnetic structures using ultra-high vacuum chambers. We also have characterisation tools such as RHEED, LEED, STM, AES, MOKE, Mott detector chamber, photo-excitation, etc.

We welcome any prospective students or researchers to contact the group.

Publications

i) Refereed full papers

1.Valladares, LD; Ccamapaza, JL, Valencia-Bedregal, RA, Borja-Castro, LE, Velazquez-Garcia, J, Perera, DHN, Ionescu, A et al.

Physical and chemical characterization of sediments from an Andean River exposed to mining and agricultural activities: The Moquegua River, Peru

INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH, 37 (6) Art. No 780 OCT 31 2022

2. Pantousa, S, Mergia, K, Ionescu, A. et al.

Fe+ ion irradiation effects in Fe-10at%Cr films irradiated at 300 degrees C

NUCLEAR MATERIALS AND ENERGY, 30 Art. No. 101147 APR 23 2022

3. Lampen-Kelley, P; Madhogaria,R, Bingham, NS, Monteiro, PMS, Steinke, NJ,  Ionescu, A et al.

Tablelike magnetocaloric effect and enhanced refrigerant capacity in EuO1-delta thin films

PHYSICAL REVIEW MATERIALS, 5 (9) Art. No. 094404 SEP 10 2021

4. Aboljadayel, ROM; Ionescu, A et al.

Growth and Characterisation Studies of Eu3O4 Thin Films Grown on Si/SiO2 and Graphene

            NANOMATERIALS, 11 (6) Art No. 1598 JUL 5 2021

5. Liu, J, Singh, A, Liu, YYF, Ionescu, A, et al.,

            Exchange Bias in Magnetic Topological Insulator Superlattices

            NANO LETTER, 20 (7) Art. No. ‏ 5315JUL 8 2020 

6. Mallick, K, Wagh, AA, Ionescu, A,  et al.,

            Magnetoresistance effects in Pt / EuO 1 - x

            APPLIED PHYSICS LETTERS, 116 (20) MAY 18 2020 

7. Mallick, K, Wagh, AA, Ionescu, A,  et al.,

            Role of spin mixing conductance in determining thermal spin pumping near the ferromagnetic phase transition in EuO1-x and La2NiMnO6

            PHYSICAL REVIEW B, 100 (22) Art. No. 224403 DEC 2 2019 

8. Wang, S.-J., Venkateshvaran, D, Mahani, MR, Chopra, U, McNellis, ER, Di Pietro, R, Schott, S, Wittmann, A, Schweicher, G, Cubukcu, M, Kang, K, Carey, R, Wagner, TJ, Siebrecht, JNM, Wong, DPGH, Jacobs, IE, Aboljadayel, RO, Ionescu, A, et al.,

            Long spin diffusion lengths in doped conjugated polymers due to enhanced exchange coupling

            NATURE ELECTRONICS, 2 Art. No. 98 MAR 2019 

9. Ionescu, A, Llandro, J, and Ziebeck, KRA

            Magnetism, Magnetic Materials and Nanoparticles

            MAGNETIC NANOPARTICLES IN BIOSENSING AND MEDICINE, Pages: 1-51 Feb 2019

10. Singh, A, Kamboj, VS, Liu, J, Llandro, J, Duffy, LB, Senanayak, SP, Beere, HE, Ionescu, A, et al.,

            Systematic Study of Ferromagnetism in CrxSb2-xTe3 Topological Insulator Thin Films using Electrical and Optical Techniques

            SCIENTIFIC REPORTS, ‏ 8Art. No. 17024 NOV 16 2018 

11. Zhou, Ke Xu, Ionescu, A, Wan, E, et al.,

            Paramagnetism in Bacillus spores: Opportunities for novel biotechnological applications

            BIOTECHNOLOGY AND BIOENGINEERING, 115 (4 ) Art. No. ‏ 955APR 2018 

12. Khalid, N, Kim, J. -Y., Ionescu, A, et al.,

            Structure and magnetic properties of an epitaxial Fe(110)/MgO(111)/GaN(0001) heterostructure

            JOURNAL OF APPLIED PHYSICS, 129 (10 )Art. No. 103901 MAR 14 2018 

13. Kim, J.-Y., Ionescu, A, Mansell, R, et al.,

            Structural and magnetic properties of ultra-thin Fe films on metal-organic chemical vapour deposited GaN(0001)

            JOURNAL OF APPLIED PHYSICS, ‏ (4)121Art. No. 043904 JAN 28 2017

14. De los Santos, VL, Bustamante, D, Ionescu, A, et al.,

            Thermal oxidation of amorphous germanium thin films on SiO2 substrates

            SEMICONDUCTOR SCIENCE AND TECHNOLOGY, 31 (12) Art. No 125017 DEC 2016 

15. Monteiro, PMS, Baker, PJ, Hine, NDM, Steinke, N-J, Ionescu, A, et al.

            Elevated Curie temperature and half-metallicity in the ferromagnetic semiconductor LaxEu1-xO

            PHYSICAL REVIEW B, 92 (4): Art. No. 045202 JUL 9 2015 

16. Vyas, KN, Love, DM, Ionescu, A, et al.

            The Scanning TMR Microscope for Biosensor Applications

            BIOSENSORS, 5 (2), Art. No. 172 2015 APR 02 2015 

17. De Los Santos, VL, Ionescu, A, Holmes, S, et al.

            Characterization of Ni thin films following thermal oxidation in air

            JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 32: Art. No. 051808 SEP 23 2014

18. Cooper, JFK, Ionescu, A, Langford, RM, et al.

            Core/shell magnetism in NiO nanoparticles

            JOURNAL OF APPLIED PHYSICS, 114 (8): Art. No. 083906 AUG 28 2013

19. Monteiro, PMS, Baker, PJ, Ionescu, A, et al.

            Spatially Homogeneous Ferromagnetism below the Enhanced Curie Temperature in EuO1-x Thin Films

            PHYSICAL REVIEW LETTERS, 110 (21): Art. No. 217208 MAY 23 2013

20. Chin, S-L, Ionescu, A, Reeve, RM, et al.

            Ab-initio calculation of C and CO adsorption on the Co (110) surface

            SURFACE SCIENCE, 608: Art. No. 282 FEB 2013

21. Edgcombe, CJ, Ionescu, A, Loudon, JC, et al.

            Characterisation of ferromagnetic rings for Zernike phase plates using the Aharonov-Bohm effect

            ULTRAMICROSCOPY, 120: Art. No. 78 SEP 2012

22. Reeve, RM., Chin, S-L, Kopper, K-P, Ionescu, A, and Barnes CHW.

            Experimental and theoretical study of electron-beam-induced spin-reorientation transition reversal in the CO/Co(110) system

            JOURNAL OF PHYSICS D-APPLIED PHYSICS, 45: Art. No. 275003 JUL 11 2012

23. Reeve, RM, Chin, S-L, Ionescu, A, et al.

            Modification of the secondary-electron spin polarization in Co/Cu(110) films via gaseous adsorbates

            PHYSICAL REVIEW B, 84: Art. No. 184431 NOV 28 2011

24. Barbagallo, M, Stollenwerk, T, Kroha, J, Steinke, NJ, Hine, NDM, Cooper, JFK, Barnes, CHW, Ionescu, A, et al.

            Thickness-dependent magnetic properties of oxygen-deficient EuO

            PHYSICAL REVIEW B, 84: Art. No. 075219 AUG 26 2011

25. Thomas, KR, Ionescu, A, Gwyther, J, et al.

            Magnetic properties of ceramics from the pyrolysis of Polyferrocenylsilane films doped with palladium

            JOURNAL OF APPLIED PHYSICS, 109 (7): Art. No. 073904 APR 1 2011

26. Ionescu, A, Darton, NJ, Vyas, KN, and Llandro, J. (Invited)

            Detection of endogenous magnetic nanoparticles with a TMR sensor

            PHILOSOPHICAL TRANSACTIONS A, 368: Art. No. 4371 AUG 21 2010

27. Llandro, J, Palfreyman, JJ, Ionescu, A, and Barnes, CHW. (Invited)

            Magnetic biosensor technologies for medical applications: a review

            MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING, 48 (10): Art. No.977

            OCT 2010: DOI 10.1007/s11517-010-0649-3

28. Kurebayashi, H, Trypiniotis, T, Lee, K, Moutafis, C, Easton, S, Ionescu, A, et al.

            Numerical calculation model for spin-dependent transport of photoexcited electrons across Fe/GaAs(001) interfaces

            J. PHYS. D: APPLIED PHYSICS, 43: Art. No. 305001 JUL 13 2010

29. Barbagallo, M, Hine, NDM, Cooper, JFK, Steinke, NJ, Ionescu, A, et al.

            Experimental and theoretical analysis of magnetic moment enhancement in oxygen-deficient EuO

            PHYSICAL REVIEW B, 81 (23): Art. No. 235216 JUN 29 2010

30. Rungsawang, R, da Silva, J, Wu, CP, Sivaniah, E, Ionescu, A, et al.

            Magnetically Induced Pattern Formation in Phase Separating Polymer-Solvent-Nanoparticle Mixtures

            PHYSICAL REVIEW LETTERS, 104 (25): Art. No. 255703 JUN 22 2010

31. Easton, S, Ionescu, A, et al.

            The initial growth mode of Co on Cu(311)

            JOURNAL OF APPLIED PHYSICS, 107 (9): Art. No. 09E101 MAY 1 2010

32. Easton, S, Kupper, D, Ionescu, A, et al.

            Spin-engineering in the Co75Fe25/Cu(110) system

            JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 322 (17): Art. No. 2493  MAR 19 2010

33. Kurebayashi, H, Trypiniotis, T, Lee, K, Easton, S, Ionescu, A, et al.

            Electrical determination of the spin relaxation time of photoexcited electrons in GaAs

            APPLIED PHYSICS LETTERS, 96 (2): Art. No. 022505 JAN 11 2010

34. De Los Santos, VL, Lee, D, Seo, J, Leon, FL, Bustamante, DA, Suzuki, S, Majima, Y, Mitrelias, T, Ionescu, A, and Barnes, CHW.

            Crystallization and surface morphology of Au/SiO2 thin films following furnace and flame annealing

            SURFACE SCIENCE, 603 (19): Art. No. 2978 OCT 1 2009

35. Hong, B, Hayward, TJ, Jeong, J-R, Cooper, JFK, Palfreyman, JJ, Mitrelias, T, Ionescu, A, et al.

            Design and fabrication of SU8 encapsulated digital magnetic carriers for high throughput biological assays

            JOURNAL OF APPLIED PHYSICS, 105 (3): Art. No. 034701 FEB 1 2009

36. Darton, NJ, Sederman, AJ, Ionescu, A, et al.

            Manipulation and tracking of superparamagnetic nanoparticles using MRI

            NANOTECHNOLOGY, 19 (39): Art. No. 395102 OCT 1 2008

37. Laloe, JB, Ionescu, A, et al.

            Effect of MgO barriers on ferromagnetic metallic layers studied by polarized neutron reflectivity

            APPLIED PHYSICS LETTERS, 93 (1): Art. No. 012505 JUL 7 2008

38. Kupper, D, Ionescu, A, et al.

            Distinct evolution of magnetism and anisotropy of ultrathin CoFe and Co films on Cu(110) upon gas adsorption

            JOURNAL OF APPLIED PHYSICS, 103 (7): Art. No. 07C911 APR 1 2008

39. Laloe, JB, Ionescu, A, et al.

            Control of epitaxy-induced magnetocrystalline anisotropy in a molecular beam epitaxy-grown Co/MgO/Fe/MgO(100) pseudo-spin-valve

            APPLIED PHYSICS LETTERS, 92 (8): Art. No. 082505 FEB 25 2008

40. Gillingham, DM, Tselepi, M, Ionescu, A, et al.

            Smoothening of ultrathin Fe films grown on GaAs(100) observed by scanning tunneling microscopy and Brillouin light scattering

            PHYSICAL REVIEW B, 76 (21): Art. No. 214412 DEC 2007

41. Kurebayashi, H, Steinmuller, SJ, Laloe, JB, Trypiniotis, T, Easton, S, Ionescu, A, et al.

            Initial/final state selection of the spin polarization in electron tunneling across an epitaxial Fe/GaAs(001) interface

            APPLIED PHYSICS LETTERS, 91 (10): Art. No. 102114 SEP 3 2007

42. Ionescu, A, Tselepi, M, Gillingham, DM, et al.

            Submonolayer growth of Fe on a GaAs(100)-2x6 reconstructed surface

            i) PHYSICAL REVIEW B, 72 (12): Art. No. 125404 SEP 2005 and ii) Virtual Journal of

            Nanoscale Science & Technology 12 (11): SEP 12 2005

43. Vaz, CAF; Ionescu, A; Trypiniotis, T, et al.

            Magnetic properties of Fe/AlOx/GaAs(001) structures

            JOURNAL OF APPLIED PHYSICS, 97 (10): Art. No. 10J119 Part 3 MAY 15 2005

44. Ionescu, A, Vaz, CAF, Trypiniotis, T, et al.

            Structural, magnetic, electronic, and spin transport properties of epitaxial Fe3Si/GaAs(001)

            i) PHYSICAL REVIEW B, 71 (9): Art. No. 094401 MAR 2005 and ii) Virtual Journal of

            Nanoscale Science & Technology 11 (10): MAR 14 2005

45. Choi, KY, Lemmens, P, Pommer, J; Ionescu, A, et al.

            Random magnetism in the frustrated triangular spin ladder KCu5V3O13

            PHYSICAL REVIEW B, 70 (17): Art. No. 174417 NOV 2004

46. Moore, TA, Ionescu, A, Bland, JAC

            Field sweep rate dependence of domain-wall speed distributions in a thin Ni80Fe20 film

            JOURNAL OF APPLIED PHYSICS, 96 (11): 6546-6549 DEC 1 2004

47. Steinmuller, SJ, Tselepi, M, Wastlbauer, G, Strom, V, Gillingham, DM, Ionescu, A, et al.

            Spin dynamics in an ultrathin Fe film in the vicinity of the superparamagnetic/ferromagnetic phase transition

            PHYSICAL REVIEW B, 70 (2): Art. No. 024420 JUL 2004

48. Kataev, V, Pommer, J, Choi, KY, Lemmens, P, Ionescu, A, et al.

            Magnetic exchange in a low-dimensional complex oxide ((Cu, Zn)(2)V2O7

            JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 272: 933-934 Part 2 Sp. Iss. SI MAY 2004

49. Taniyama, T, Wastlbauer, G, Ionescu, A, et al.

            Spin-selective transport through Fe/AlOx/GaAs(100) interfaces under optical spin orientation

            PHYSICAL REVIEW B, 68 (13): Art. No. 134430 OCT 1 2003

50. Bland, JAC, Steinmuller, SJ, Hirohata, A, Cho, WS, Xu, YB, Guertler, CM, Wastlbauer, G, Ionescu, A, et al.

            Electron spin filtering in ferromagnet/semiconductor heterostructures

            JOURNAL OF PHYSICS D-APPLIED PHYSICS, 36 (18): 2204-2210 SEP 21 2003

51. Andresen, SE, Steinmuller, SJ, Ionescu, A, et al.

            Role of electron tunneling in spin filtering at ferromagnet/semiconductor interfaces

            PHYSICAL REVIEW B, 68 (7): Art. No. 073303 AUG 15 2003

52. Pommer, J, Kataev, V, Choi, KY, Lemmens, P, Ionescu, A, et al.

            Interplay between structure and magnetism in the spin-chain compound (Cu,Zn)(2)V2O7

            PHYSICAL REVIEW B, 67 (21): Art. No. 214410 JUN 1 2003

53. Klauss, HH, Lemmens, P, Birke, M, Baabe, D, Mienert, D, Litterst,FJ, Amato, A, Pommer, J, Ionescu, A, et al.

            Spin dynamics in the quantum spin system KCu5V3O13

            PHYSICA B-CONDENSED MATTER, 326 (1-4): 436-439 FEB 2003

54. Lemmens, P, Choi, KY, Ionescu, A, et al.

            Low energy singlets in the excitation spectrum of the spin tetrahedra system Cu2Te2O5Br2

            JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 63 (6-8): 1115-1117 JUN-AUG 2002

55. Sparta, K, Redhammer, GJ, Roussel, P, Heger, G, Roth, G, Lemmens, P, Ionescu, A, et al.

            Structural phase transition in the 2D spin dimer compound SrCu2(BO3)(2)

            EUROPEAN PHYSICAL JOURNAL B, 19 (4): 507-516 FEB 2001

ii) Refereed conference publications

1. Kamboj, VS, Singh, A, Jakob, L, Duffy, LB, Idros, N, Senanayak, SP, Ionescu, A, et al.,

            Temperature dependence of the ferromagnetic response in CrxSb2-xTe3 topological insulator thin films investigated using terahertz spectroscopy and magneto-transport

            Proceedings of SPIE, ‏ 10917Art. No. UNSP 109171T ‏ FEB 2019 

2. Reeve, R, Chin, SL, Kopper, KP, Ionescu, A and Barnes, CHW.

            Electron Beam Tuning of the Magnetic Anisotropy in Co/Cu(110) Films

            IEEE TRANSACTIONS ON MAGNETICS, 47 (6): 1554-155 JUN 2011

3. Hong, B, Jeong, J-R, Llandro, J, Hayward, TJ, Ionescu, A, et al.

            High Throughput Biological Analysis Using Multi-bit Magnetic Digital Planar Tags

            AIP Conf. Proc. “BIOMAGNETISM AND MAGNETIC BIOSYSTEMS BASED ON

            MOLECULAR RECOGNITION PROCESSES”, edited by Bland JAC and Ionescu A, 1025: Art. No. 74 JUN 19 2008

4. Barbagallo, M, van Belle, F, Ionescu, A, et al.

            Digitally Encoded Exchange Biased Multilayers

            AIP Conf. Proc. “BIOMAGNETISM AND MAGNETIC BIOSYSTEMS BASED ON

            MOLECULAR RECOGNITION PROCESSES”, edited by Bland JAC and Ionescu A, 1025: Art. No. 52 JUN 19 2008

5. Laloe, JB, van Belle, F, Ionescu, A, et al.

            Room-temperate study of the magnetic moment of ultrathin Fe films on GaAs(100) and    InAs(100)

            IEEE TRANSACTIONS ON MAGNETICS, 42 (10): 2933-2935 OCT 2006

6. Ionescu, A, Vaz, CAF, Trypiniotis, T, et al.

            Magnetic and structural properties of stoichiometric thin Fe3Si/GaAs(001) films

            JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 286: 72-76 Sp. Iss. SI FEB 1 2005