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1.
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Temperature Dependence of the Hyperfine Magnetic Field at Fe Sites in Ba-Doped BiFeO$_3$ Thin Films Studied by Emission Mössbauer Spectroscopy
/ Heiniger-Schell, Juliana (CERN ; Duisburg-Essen U.) ; Bharuth-Ram, Krish (ENS, Lyon, Lab. Phys. ; KwaZulu Natal U. ; DUT, Durban) ; Naicker, Kimara (ENS, Lyon, Lab. Phys. ; KwaZulu Natal U.) ; Masondo, Vusumuzi (DUT, Durban) ; Dang, Thien Thanh (Duisburg-Essen U.) ; Escobar, Marianela (Duisburg-Essen U.) ; Díaz-Guerra, Carlos (Madrid U.) ; Marschick, Georg (Vienna, Tech. U.) ; Masenda, Hilary (Witwatersrand U.) ; Gunnlaugsson, Haraldur P (Iceland U.) et al.
Emission $^{57}$Fe Mössbauer spectroscopy (eMS), following the implantation of radioactive $^{57}$Mn+ ions, has been used to study the temperature dependence of the hyperfine magnetic field at Fe sites in Ba-doped BiFeO$_3$ (BFO) thin films. $^{57}$Mn β decays (t$_{1/2}$ = 90 s) to the 14.4 keV Mössbauer state of $^{57}$Fe, thus allowing online eMS measurements at a selection of sample temperatures during Mn implantation. [...]
2023 - 13 p.
- Published in : Crystals 13 (2023) 724
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Compositional Dependence of Epitaxial
L
1
0
‐Mn
x
Ga Magnetic Properties as Probed by
57
Mn/Fe and
119
In/Sn Emission Mössbauer Spectroscopy
/ Unzueta, Iraultza (Basque U., Bilbao) ; Gunnlaugsson, Haraldur Pall (Iceland U.) ; Mølholt, Torben Esmann (CERN) ; Masenda, Hilary (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Mokhles Gerami, Adeleh (IPM, Tehran) ; Krastev, Petko (Sofiya, Inst. Nucl. Res.) ; Zyabkin, Dmitry V (Ilmenau Tech. U.) ; Bharuth-Ram, Krish (KwaZulu Natal U.) ; Naidoo, Deena (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Ólafsson, Sveinn (Iceland U.) et al.
The magnetic properties of MnxGa alloys critically depend on compositionx, andthe atomic-scale origin of those dependences is still not fully disclosed. Molecularbeam epitaxy has been used to produce a set of MnxGa samples (x¼0.7÷1.9)with strong perpendicular magnetic anisotropy, and controllable saturationmagnetization and coercivefield depending onx. [...]
2022 - 11 p.
- Published in : Phys. Status Solidi B 259 (2022) 2200121
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Anisotropy of the Electric Field Gradient in Two-Dimensional α-MoO$_3$ Investigated by $^{57}$Mn($^{57}$Fe) Emission Mössbauer Spectroscopy
/ Schell, Juliana (CERN ; Duisburg-Essen U.) ; Zyabkin, Dmitry (Ilmenau Tech. U.) ; Bharuth-Ram, Krish (KwaZulu Natal U.) ; Gonçalves, João N (Aveiro U.) ; Díaz-Guerra, Carlos (Madrid U.) ; Gunnlaugsson, Haraldur P (Iceland U.) ; Martín-Luengo, Aitana Tarazaga (Linz U.) ; Schaaf, Peter (Ilmenau Tech. U.) ; Bonanni, Alberta (Linz U.) ; Masenda, Hilary (Witwatersrand U. ; Philipps U. Marburg) et al.
Van der Waals α-MoO3 samples offer a wide range of attractive catalytic, electronic, and optical properties. We present herein an emission Mössbauer spectroscopy (eMS) study of the electric-field gradient (EFG) anisotropy in crystalline free-standing α-MoO3 samples. [...]
2022 - 13 p.
- Published in : Crystals 12 (2022) 942
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Unusual charge states and lattice sites of Fe in Al$_{x}$Ga$_{1−x}$N:Mn
/ Masenda, Hilary (Witwatersrand U. ; Philipps U. Marburg) ; Gunnlaugsson, Haraldur Páll (Iceland U.) ; Adhikari, Rajdeep (Linz U.) ; Bharuth-Ram, Krish (DUT, Durban) ; Naidoo, Deena (Witwatersrand U.) ; Tarazaga Martín-Luengo, Aitana (Linz U.) ; Unzueta, Iraultza (Basque U., Bilbao) ; Mantovan, Roberto (CNR-IMM, Catania) ; Mølholt, Torben Esmann (CERN) ; Johnston, Karl (CERN) et al.
Charge states and lattice sites of Fe ions in virgin and Mn-doped Al$_{x}$Ga$_{1−x}$N samples were investigated using $^{57}$Fe emission Mössbauer spectroscopy following radioactive $^{57}$Mn$^{+}$ ion implantation at ISOLDE, CERN. In the undoped Al$_{x}$Ga$_{1−x}$N, Fe$^{2+}$ on Al/Ga sites associated with nitrogen vacancies and Fe$^{3+}$ on substitutional Al/Ga sites are identified. [...]
2022 - 12 p.
- Published in : New J. Phys. 24 (2022) 103007
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5.
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Magnetic Structure and Strain State in Fe/V Superlattices Studied by $^{57}$Fe$^+$ Emission and Conversion Electron Mössbauer Spectroscopy
/ Mølholt, Torben E (Iceland U. ; CERN) ; Ólafsson, Sveinn (Iceland U.) ; Gunnlaugsson, Haraldur P (Iceland U.) ; Qi, Bingcui (Iceland U.) ; Johnston, Karl (CERN) ; Mantovan, Roberto (IMM, Bologna) ; Masenda, Hilary (Witwatersrand U.) ; Bharuth-Ram, Krish (DUT, Durban) ; Gíslason, Hafliði P (Iceland U.) ; Langouche, Guido (Leuven U.) et al.
The magnetic properties of the Fe/V superlattices were studied by conventional Conversion Electron Mössbauer Spectroscopy (CEMS) and online 57Fe+ emission Mössbauer Spectroscopy (eMS) at room temperature (RT) at ISOLDE/CERN. The unique depth-enhanced sensitivity and ultradiluted regime of the probe atoms adopted in this eMS facility enabled the investigation of the magnetic structures and the strain state in the superlattice layers and at the interfaces. [...]
2022 - 15 p.
- Published in : Crystals 12 (2022) 961
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6.
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Lattice sites, charge and spin states of Fe in In$_{x}$Ga$_{1-x}$N studied with emission Mössbauer spectroscopy
/ Masenda, Hilary (School of Physics, University of the Witwatersrand) ; Gunnlaugsson, Haraldur Páll (Science Institute, University of Iceland) ; Naidoo, Deena (School of Physics, University of the Witwatersrand) ; Bharuth-Ram, Krish (School of Physics, Durban University of Technology) ; Mantovan, Roberto (Laboratorio MDM, IMM-CNR,) ; Gíslason, Hafliði Pétur (Science Institute, University of Iceland) ; Vantomme, André (Instituut voor Kern-en Stralings fysika, KU Leuven) ; Bonanni, Alberta (Institute for Semiconductor and Solid State Physics, Johannes Kepler University) ; Adhikari, Rajdeep (Institute for Semiconductor and Solid State Physics, Johannes Kepler University) ; Bockstedte, Michel (Institute for Theoretical Physics, Johannes Kepler University) et al.
CERN-INTC-2020-006 ; INTC-SR-101.
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2020.
Fulltext - Original Document (INTC-P-485)
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7.
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Atomic-Scale Magnetic Properties of Truly 3d-Diluted ZnO
/ Mantovan, Roberto (IMM-CNR, Agrate Brianza,Italy) ; Gunnlaugsson, Haraldur Páll (Leuven U. ; Aarhus U.) ; Johnston, Karl (CERN) ; Masenda, Hilary (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Mølholt, Torben Esmann (Iceland U.) ; Naidoo, Deena (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Ncube, Mehluli (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Shayestehaminzadeh, Seyedmohammad (Iceland U.) ; Bharuth-Ram, Krish (DUT, Durban ; iThemba LABS) ; Fanciulli, Marco (IMM-CNR, Agrate Brianza,Italy ; Milan Bicocca U.) et al.
In search for dilute magnetic semiconductors, the magnetic properties at the atomic-scale of Fe atoms incorporated in ZnO, in a concentration range of more than five orders of magnitude from $1 × 10^{−5}$ to 2.2 at% have been probed using emission 57 Fe Mössbauer spectroscopy on implanted $^{57}Mn$ and $^{57}Co$ produced at ISOLDE/CERN. In the ultra-dilute regime ($10 ^{−5}$ at%), the system shows isolated paramagnetic $Fe^{3+}$ ions with a spin–lattice type of relaxation. [...]
2015
- Published in : Advanced Electronic Materials 1 (2015) 1400039
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8.
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Emission Mössbauer spectroscopy using ^{57}Co to study magnetism in C-implanted ZnO
/ Bharuth-Ram, Krish (Durban University of Technology, South Africa.) ; Masenda, Hilary (University of the Witwatersrand, South Africa.) ; Moodley, Matthew (University of KwaZulu-Natal, South Africa.) ; Naidoo, Deena (University of the Witwatersrand, South Africa.) ; Gunnlaugsson, Haraldur Páll (University of Iceland, Iceland.) ; Doyle, Terence Brian (Themba LABS, South Africa.) ; Ronning, Carsten (Friedrich-Schiller University Jena, Germany.) ; Schaaf, Peter (Technisch Universität-Ilmenau, Germany.)
CERN-INTC-2017-075 ; INTC-I-200.
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2017.
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9.
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Atomic scale properties of magnetic Mn-based alloys probed by emission Mössbauer spectroscopy
/ Mantovan, Roberto (Laboratorio MDM, IMM-CNR, Via Olivetti 2, I-20864 Agrate Brianza (MB), Italy) ; Gunnlaugsson, Haraldur Pall (Department of Physics and Astronomy, Aarhus University, DK-8000 Århus C, Denmark) ; Zenkevich, Andrei (NRC “Kurchatov Institute”, Moscow, Russian Federation) ; Zhao, Jianhua (State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, China) ; Plazaola, Fernando (Dpto. Electricidad y Electronica, Universidad del Pais Vasco (UPV/EHU), CP. 644, 48080 Bilbao, Spain) ; Johnston, Karl (-) ; Masenda, Hilary (School of Physics, University of the Witwatersrand, WITS 2050, South Africa) ; Mølholt, Torben (Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík, Iceland) ; Naidoo, Deena (School of Physics, University of the Witwatersrand, WITS 2050, South Africa) ; Ncube, Masuli (School of Physics, University of the Witwatersrand, WITS 2050, South Africa) et al.
CERN-INTC-2013-028 ; INTC-P-388.
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2013.
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