Under applied bias V, only the QWS with energies E σ n that lie within the bias window from -eV/2 to +eV/2, denoted by the shaded area in Figure 2. contribute to the resonant tunneling. This can be seen clearly in Figure 3a and Figure 3b, where we display the low-temperature (T=5K) bias dependence of the spin-polarized currents, I ↑ (up triangles) and I ↓ (down triangles), for N C =4AS and N C =7AS, respectively, and for θ=π/2. The spin-polarized currents switch on at V σ on=2|E σ n-E F |, when the n σ QWS enters the bias energy window. For N C =7AS, the switch on for both spin-polarized currents occur at about the same bias, V ↑ on≈ V ↓ on due to the fact that |E 1 ↓ -E F | ≈ |E 3 ↑ -E F | as one can see in Figure 2. Both currents decrease with increasing bias because the density of states of the minority band in the leads decreases. In Figure 3c and Figure 3d we display the low-temperature (T = 5K) bias behavior of the parallel, T i,|| , (squares) and perpendicular T i,┴ (circles) components of the local spin torque on the first site in the central FM, for θ=π/2 and for N C =4AS and N C =7AS, respectively. The local spin-transfer component, T i,|| exhibits a switch on bias behavior at V σ on, similar to that of the spin polarized currents in Figure 3a. On the other hand, T i,┴ which is non-zero for zero bias, displays a non-monotonic bias dependence, changing sign Figure 3: Low-temperature (T=5K) bias dependence of the majority (up triangles) and minority (down triangles) currents in the central FM for (a) N C =4AS and (b) N C =7AS, respectively, and for $\theta=\pi/2$. Bias dependence of T i,|| , (squares) and perpendicular T i,┴ (circles) on the first site in the central FM, for (c) N C =4AS and (d) N C =7AS. The bias V σ on denote the switch-on bias. between V ↑ on and V ↓ on similar to that of the exchange field in quantum dots connected to FM leads [11]. It is important to note in Figure 3d the scale which shows that both T i,|| and T i,┴ are strongly enhanced for N C =7AS, even though the corresponding spin-polarized currents are smaller than those for N C =4AS. This clearly demonstrates that the underlying mechanism that controls the enhancement of the efficiency of the local spin-transfer torque is the close proximity of the majority and minority QWS energies of different quantum number within the bias energy window. This in turn enhances the spin mixing σ↔σ’ in the central FM, when electrons tunnel resonantly through the spin polarized QWS. The enhancement of the local spin-transfer torque is independent of the parity of the QWS wavefunctions. This spin-transfer torque enhancement may have important technological applications since the CIMS may be facilitated under such conditions in DBMTJ. References [1] Slonczewski J.C., J. Magn. Magn. Mater. 159 (1996) L1; Berger L., Phys. Rev. B 54 (1996) 9353 [2] Zutic I., Fabian J., Das Sarma S., Rev. Mod. Phys. 76 (2004) 323. [3] Parkin S.S.P et al.., J. Appl. Phys. 85 (1999) 5828. [4] Krivorotov I.N., Emely N.C., Sankey J.C., Kisilev S.I., Ralph D.C., Buhrman R.A., Science 307 (2005) 228. [5] Zhang X., Li B.-Z., Sun G., Pu F.-C., Phys. Rev. B 56 (1997) 5484. [6] Lu Z.-Y., Zhang X.-G., Pantelides S.T., Phys. Rev. Lett. 94 (2005) 207210. [7] Zeng Z.-M., Han X.-F., Zhan W.-S., Wang Y., Zhang Z. , Zhang S., Phys. Rev. B 72 (2005) 054419. [8] Nozaki T., Tezuka N., Inomata K., Phys. Rev. Lett. 96 (2006) 027208. [9] Moodera J.S. et al., Phys. Rev. Lett. 83 (1999) 3029. [10] Theodonis I., Kalitsov A., Kioussis N., arXiv:cond-mat/0703789v1. [11] Braun M., Konig J., Martinek J., Phys. Rev. B 70 (2004) 195345. 119
3 η Προφορική Συνεδρία «Συστήματα με Ισχυρές Συσχετίσεις»
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XXIII ΠΑΝΕΛΛΗΝΙΟ ΣΥΝΕ
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Κοιτώντας τα πρακτ
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ΕΠΙΤΡΟΠΕΣ Οργανωτι
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ΠΡΟΓΡΑΜΜΑ ΣΥΝΕΔΡΙΟ
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21. Οργανικά τρανζίσ
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15:30 15:45 16:00 16:15 16:30 16:45
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41. Modeling and quantitative phase
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Ανοιχτή Συνεδρία «
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«NανοΥλικά και Νανο
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New materials and MOS device concep
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Reliability Characteristics of Rare
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Ο λόγος των ταχυτήτ
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Thus the mean R In-In is expected t
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FIG 1. Schematic representation of
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με 0.80 eV στη διεπιφά
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Εντοπισµός Φορέων
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Παρασκευή και Xαρακ
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Electrical Spin Injection from Fe i
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Electrical Spin Injection of Spin-P
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References [1] CH Lee, J. Meteer, V
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Σχήμα 1: Φωτογραφία
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SEM Image Layout Simulation Εικ
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Μελέτη Ατελειών Σε
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Facet-Stress-Driven Ordering in SiG
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νανοκρυσταλλίτης (a
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Σχήµα 1. Εικόνες περ
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Σχήµα 1. Εικόνες περ
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Οι δομές που αναπτύ
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Raman Intensity (10 -50 cm 3 ) 1,2
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Μελέτη της Επίδρασ
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Annealing Induced Dissociation of N
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`Εναπόθεση με Παλμι
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Μελέτη της Χημείας
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Ανάπτυξη Νέων Μεσο
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Application of Thermal Quadrupoles
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Στοχαστική προσομο
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Νανοτραχύτητα κατά
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Ευαισθησία και Δια
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Optical Properties of CuIn 1-x Ga x
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ανοπτημένο με λέιζ
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Στο σχήμα 3 φαίνοντ
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Id (mA) -0,3 -0,2 -0,1 Vg=0 Vg=-1 V
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Strained-Si Si 1-x Ge x graded Si 1
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Επίδραση της Τοπολ
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(α) (β) Σχήμα 2: (α) Απε
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Figure 3. Generation 4 PAMAM-H 2 O
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Από όλα τα παραπάνω
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Το PHEGMA είναι άμορφο
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PS HAuCl 4 P2VP Ion loading PSP2VP
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The nonlinear optical response of A
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νανοσωµατίδια. Όπω
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Bioactive Glass/Nanodiamonds system
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Energy Loss Rates of Hot Electrons
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Σύνθεση και Χαρακτ
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μπορεί να ερμηνευτ
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Nανοσυνθέτα Εποξει
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[1] S. Iijima, Nature 354, 56 (1991
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Figure 3: GCMC calculations for und
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μερών, εμφανίζοντα
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1.0 Reflectance 1.1 1.0 0.9 0.8 0.7
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στο συντελεστή διέ
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¿ÔÖØÑÒØÓÐØÖÐÒÒÖÒ¸
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Συναπόθεση Cr - Ni σε
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Investigation of the Structural, Mo
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Modification of Perlite Cementitiou
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Templated Sol-Gel Synthesis Of TiO
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Παρασκευή Υμενίων
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Preparation of YSZ Solid Electrolyt
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Σύνθεση, Ανισοτροπ
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Μελέτη ανθρώπινων
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Local Coordination of Zn and Fe in
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Επίδραση της Προσθ
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Αλκαλική Σύνθεση κ
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Μηχανικές Iδιότητε
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The Influence of Thermal Aging on t
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Modeling and quantitative phase ana
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Συμβολή στη Συντήρ
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Κρυσταλλική Συµπερ
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Σύνθεση Στερεών ∆ι
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Fabrication and Characterization of
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∆ιερεύνηση δυνατό
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Συγκριτική αξιολόγ
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6 η Προφορική Συνεδ
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Ηλεκτρομαγνητική Α
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Φασματοσκοπική Μελ
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Thermal and Electrical Properties o
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Structure, Mechanical, and Optoelec
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Designing Nanoporous Materials for
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This program was developed to serve
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Νέα Αυτό-οργανούμε
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A Physical Model to Interpret the E
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FIR study of Ag x (As 33 S 33 Se 33
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Mελέτη Μεικτών Γυαλ
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The Structural Role of Fe and Zn in
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ΕΥΡΕΤΗΡΙΟ ΣΥΓΓΡΑΦΕ
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Κομπίτσας Μ…………
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ΕΥΡΕΤΗΡΙΟ ΣΥΓΓΡΑΦΕ
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W Watson I.M………………4 Weg