HFI/NQI 2010

Session

MAGNETISM AND MAGNETIC MATERIALS: BULK AND THIN FILMS

Sep 14, 2010, 11:10 AM

500/1-001 - Main Auditorium (CERN)

Conveners

MAGNETISM AND MAGNETIC MATERIALS: BULK AND THIN FILMS

• Jochen Litterst (TU Braunschweig)

MAGNETISM AND MAGNETIC MATERIALS: BULK AND THIN FILMS

• Yutaka Yoshida

MAGNETISM AND MAGNETIC MATERIALS: BULK AND THIN FILMS

• Stephan COTTENIER

151. Magnetism in Iron Implanted Oxides: A Status Report

Dr Rainer Sielemann (Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany)

9/14/10, 11:10 AM

Magnetism and Magnetic materials - Bulk and thin layers

INVITED SPEAKER

Diluted magnetic semiconductors form a special class of magnetic materials which has drawn a lot of attention over the last years both for the interest in the basic physics involved and for possible applications, e.g., in the field of spintronics. However, there is no general agreement on the origin of this type of magnetism. Various coupling mechanisms between the magnetic ions have been...

47. Mössbauer study of spin-lattice relaxations of dilute Fe3+ in MgO

Mr Torben Esmann Mølholt (University of Iceland)

9/14/10, 11:50 AM

Magnetism and Magnetic materials - Bulk and thin layers

ORAL CONTRIBUTION

T. E. Mølholt1, R. Mantovan2, H. P. Gunnlaugsson3, K. Bharuth-Ram4, M. Fanciulli2,5, K. Johnston6, Y. Kobayashi7, G. Langouche8, H. Masenda9, D. Naidoo9, S. Ólafsson1, R. Sielemann10, G. Weyer3, H. P. Gíslason1 1Science Institute, University of Iceland, Reykjavík, Iceland, e-mail: tem4@hi.is; 2Laboratorio MDM-IMM-CNR, Milano, Italy; 3Department of Physics and Astronomy, Aarhus...

137. Temperature dependence of the magnetic hyperfine field at 111Cd in ZnO doped with Co.

Prof. Artur Carbonari (IPEN)

9/14/10, 12:10 PM

Magnetism and Magnetic materials - Bulk and thin layers

ORAL CONTRIBUTION

The search for room temperature ferromagnetism in wide band gap semiconductor oxides has been quite intensive in the last years. In particular, ZnO has attracted attention since theoretical calculations[1,2] have indicated that ZnO when doped with a transition metal like Co or Mn should present ferromagnetism at room temperature. The results instead of clarifying this issue have however...

130. Fe as Local Probe to follow the Competition between Magnetism and Superconductivity in the New Fe-pnictide Superconductors

Prof. Elisa Baggio Saitovitch (Centro Brasileiro de Pesquisas Fisicas)

9/14/10, 2:00 PM

Magnetism and Magnetic materials - Bulk and thin layers

ORAL CONTRIBUTION

Abstract

76. Muon spin relaxation studies of geometrically frustrated magnets

Dr Pierre Dalmas de Reotier (CEA Grenoble)

9/14/10, 2:20 PM

Magnetism and Magnetic materials - Bulk and thin layers

ORAL CONTRIBUTION

See below

46. Magnetism in Azurite Studied by Muon Spin Rotation

Jochen Litterst (TU Braunschweig)

9/14/10, 2:40 PM

Magnetism and Magnetic materials - Bulk and thin layers

ORAL CONTRIBUTION

The natural mineral azurite Cu3(CO3)2(OH)2 represents a new type of low-dimensional frustrated quantum spin system with a diamond spin chain as basis. From specific heat [1] there is evidence for a phase transition at ca. 1.8 K which however is magnetically still ill-defined. Earlier muon spin rotation experiments [2] have indicated a magnetic transition yet no systematic study has been...

97. Measuring the magnetic properties of monolayers of single molecule magnets

Dr Zaher Salman (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)

9/14/10, 3:00 PM

Magnetism and Magnetic materials - Bulk and thin layers

ORAL CONTRIBUTION

text

36. Defect induced magnetic interaction in highly oriented pyrolytic graphite (HOPG): A local investigation using TDPAD method

Prof. S.N. Mishra (Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai-400005, India)

9/14/10, 3:20 PM

Magnetism and Magnetic materials - Bulk and thin layers

ORAL CONTRIBUTION

Defect induced magnetic interaction in highly oriented pyrolytic graphite (HOPG): A local investigation using TDPAD method. S.N. Mishra,1 S.K. Mohanta,1,2 S.K. Srivastava2 1Dept. of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai-400005, India, e-mail: mishra@tifr.res.in 2Dept. of Physics and Meteorology, Indian Institute of Technology, Kharagpur-721302,...

90. Low Temperature Nuclear Orientation Studies of the Magnetic Structures of RNiAl4 in Applied Magnetic Fields

Wayne Hutchison (University of NSW at ADFA)

9/16/10, 2:40 PM

Magnetism and Magnetic materials - Bulk and thin layers

ORAL CONTRIBUTION

The family of metamagnetic compounds RNiAl4 (R = rare earth) exhibits a range of interesting magnetic behaviours. There are multiple magnetic phases, and crystal field driven differences in anisotropy and behaviour when different rare earth ions (R) are present in the compound. TbNiAl4 is one illustrative example. It has two phase transitions (three phases) as a function of temperature in...

155. Perturbed angular correlation study of the magnetic and structural first-order phase transition in MnAs

J. N. Gonçalves (Departmento de Física and CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal)

9/16/10, 3:00 PM

Magnetism and Magnetic materials - Bulk and thin layers

ORAL CONTRIBUTION

text + references

18. Anomalous Magnetism and 209Bi Nuclear Spin Relaxation in Bi4Ge3O12 Crystals

Prof. Valery Orlov (Russian Research Center "Kurchatov Institute", Moscow 123182, Russia)

9/16/10, 3:20 PM

Magnetism and Magnetic materials - Bulk and thin layers

ORAL CONTRIBUTION

Unique magnetic properties were earlier found by measuring the NQI parameters in a number of bismuth (III) oxy compounds with s- and p-electrons hitherto classified as diamagnetic [1]. In α-Bi2O3 single crystal the magnetoelectric effect and paramagnetism depending on magnetic prehistory of the sample were observed [1]. In Bi4Ge3O12 (BGO), local magnetic fields (Hloc) of the order of...