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O-8 15 Thermal Memory Cell Zvonko Jagličić 1 , Marko Jagodič 1 , Janez Dolinšek 2 1 Institute of Mathematics, Physics and Mechanic & Faculty of Civil and Geodetic Engineering Univeristy of Ljubljana, Jadranska 19, Ljubljana, Slovenia 2 Jožef Stefan Institute, Jamova 39, Ljubljana, Slovenia A term “spin glass” usually denotes systems that possess two fundamental properties: frustration and randomness. These two properties lead to highly degenerate free-energy landscapes with several characteristic macroscopic magnetic properties: i) a large difference between field-cooled and zero-field-cooled magnetic susceptibilities below a freezing temperature, ii) the ZFC susceptibility exhibits a frequency-dependent cusp, iii) slow relaxation (aging) effects, and iv) a memory effect below the freezing temperature. The memory effect is observed by means of zero-field-cooled magnetization measurements with a stop during the cooling process at temperature below the freezing temperature. The spin glass like magnetic properties in Taylor-phase complex intermetallic compound T-Al 3 Mn, and its solid solutions with Pd and Fe, will be described with special emphasizes on the memory effect observed in this system.[1] We will show a new kind of memory element, a thermal memory cell, which exploit the memory effect.[2] In the thermal memory cell byte of digital information can be stored into the storage medium by pure thermal manipulation. Thermal inscription of information employs a specific temperature-time profile that involves continuous cooling and isothermal waiting time periods. We succeeded to thermally write arbitrary ASCII character into the thermal memory cell. [1] J. Appl. Phys. 106 (2009) 043917 [2] Phys. Rev. B, 77 (2008) 064430-1
O-9 16 NMR methods for investigation of complex metallic alloys Peter Jeglič 1 , Martin Klanjšek 1 , Matej Bobnar 1 , Stanislav Vrtnik 1 , Frank Haarmann 2 , Janez Dolinšek 1 1 Jožef Stefan Institute, Ljubljana, Slovenia 2 Institut für Anorganische Chemie, RWTH Aachen, Germany Complex metallic alloys (CMA’s) are intermetallic compounds characterized by (i) the large unit cells, comprising some tens up to thousands of atoms, (ii) the presence of well-defined atomic clusters, frequently of icosahedral point group symmetry and (iii) the occurrence of inherent disorder in an ideal structure [1]. In the last two decades there has been an increasing interest in CMA’s due to the structural similarity of the atomic arrangement inside the unit cell with the short-range order structure of quasicrystals, which by definition have an infinite unit cell. This is why the CMA’s are frequently referred to as approximants to the quasicrystals. Because of the large size of the unit cell, the structural determination of CMA’s is a complicated task. Diffraction methods are here an indispensable tool, whereas nuclear magnetic resonance (NMR) spectroscopy can offer complementary structural information on the local atomic scale [2-5]. The NMR spectra of quadrupolar nuclei such as 27 Al provide information on (i) the distribution of electric-field-gradient (EFG) tensors and the associated distribution of local atomic environments around the resonant nuclei, (ii) the number of crystallographically inequivalent lattice sites in the unit cell, and (iii) the local symmetry of the crystalline lattice. Various examples to demostrate the above aspects will be shown. In addition, the 27 Al NMR experiments that prove a clathrate-like structure of Co 4 Al 13 , a traditional member of CMA’s, will be presented. Recent X-ray investigation of high-quality single crystals in combination with theoretical calculations revealed a surprising analogy between Co 4 Al 13 [6] and
Page 1 and 2: ABSTRACT BOOK RECENT ADVANCES IN BR
Page 3 and 4: RECENT ADVANCES IN BROAD BAND SOLID
Page 9 and 10: INVITED LECTURES
Page 11 and 12: O-2 10 NMR in Quantum Spin Systems
Page 13 and 14: O-4 12 NMR and the quasi-one dimens
Page 15: O-7 14 NMR studies on the new iron
Page 19 and 20: O-10 18 Sodium cobaltates: A golden
Page 21 and 22: O-12 20 Broadband NMR at ultra high
Page 23 and 24: O-14 22 Strong Cu-O hybridization i
Page 25 and 26: O-16 24 Kagome Frustrated Antiferro
Page 27 and 28: O-18 26 Multiband Superconductivity
Page 29 and 30: O-20 28 Magnetic and physical prope
Page 31 and 32: O-21 30 NMR spin echo study of RF-I
Page 33 and 34: O-23 32 Clarification of Quantum Cr
Page 35 and 36: O-25 34 Nanoscale electronic order
Page 37 and 38: O-27 36 75 As NMR in Fe pnictide su
Page 39 and 40: O-29 38 NQR study of the phase segr
Page 41 and 42: O-31 40 NMR study of the Tomonaga-L
Page 43 and 44: POSTER CONTRIBUTIONS
Page 45 and 46: P-2 44 Cryogenic static and magic-a
Page 47 and 48: P-4 46 Nuclear Magnetic Resonance E
Page 49 and 50: P-6 48 Charge Induced Vortex Lattic
Page 51 and 52: P-8 50 77 Se NMR study of λ-(BETS)
Page 53 and 54: P-9 52 Electron spin relaxation in
Page 55 and 56: P-10 54 saturation field B c = 14.9
Page 57 and 58: P-12 56 Superionic Conductivity and
Page 59 and 60: P-14 58 NMR study of Quantum Critic
Page 61 and 62: P-16 60 Gap structure and vortex dy
Page 63 and 64: P-18 62 New Facility for Broadband
Page 65 and 66: P-20 64 Complex interplay of Ce 4f
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P-21 66 in our experiment. However,
Page 69 and 70:
P-23 68 Observation of the Fermi Li
Page 71 and 72:
P-25 70 Magnetic-field induced phas
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RECENT ADVANCES IN BROAD BAND SOLID
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