Chemical order and crystallographic texture of FePd:Cu thin alloy films

FePd thin films have been recently considered as promising material for high-density magnetic storage devices. However, it is necessary to find a proper method of fabrication for the (001)-textured and chemically well-ordered alloy. In this paper, we present the detailed investigations of lattice parameters, chemical order degree, grain sizes and crystallographic texture, carried out on FePd alloys with 10 at.% of Cu addition. The initial [Cu(0.2 nm)/Fe(0.9 nm)/Pd(1.1 nm)]x5 multilayers were thermally evaporated in an ultra-high vacuum on MgO(100), Si(100), Si(111) and Si(100) covered by 100 nm thick layer of amorphous SiO2. In order to obtain homogeneous FePd:Cu alloy, the multilayers were annealed in two different ways. First, the samples were rapidly annealed in nitrogen atmosphere at 600oC for 90 seconds. Next, the long annealing in a high vacuum for 1 hour at 700oC was done. This paper focuses on quantitative investigations of the chemical order degree and crystallographic texture of ternary FePd:Cu alloys deposited on four different substrates. In order to obtain both quantities we have taken a novel approach to consider the problem of dopant atoms located in the FePd structure. The studies of the structure were done using X-Ray Diffraction (XRD) performed with synchrotron radiation and pole figures measurements. We have found that the addition of Cu changes the FePd lattice parameters and lattice distortion. We have also shown, that using different substrates it is possible to obtain a FePd:Cu alloy with different chemical order and texture. Moreover, it was observed that texture category is substrate dependent

Tailoring of magnetic properties of NiO/Ni composite particles fabricated by pulsed laser irradiation

We present NiO/Ni composite particles with face-centered cubic (fcc) structure prepared by a pulsed laser irradiation of NiO nanoparticles dispersed in liquid. The sizes of particles and the Ni content in NiO/Ni composites were controlled by tuning the laser parameters, such as laser fluence and irradiation time. We found that the weight fraction of Ni has a significant impact on magnetic properties of composite particles. Large exchange bias (HEB) and coercivity field (HC) were observed at 5 K due to the creation of heterojunctions at interfaces of ferromagnetic Ni and antiferromagnetic NiO. For the NiO/Ni composites with 80% of NiO we have observed the largest values of exchange bias (175 Oe) and coercive field (950 Oe), but the increase of Ni weight fraction resulted in the decrease of both HC and HEB values

Polska i społeczeństwo w XXI wieku. Państwo i prawo w XXI wieku - szanse i zagrożenia

Słowo wstępne: "Kolejna, czwarta już międzynarodowa konferencja zorganizowana przez Krakowską Szkolę Wyższą im. Andrzeja Frycza Modrzewskiego poświęcona została problematyce nowych wyzwań w różnych dziedzinach życia społecznego w perspektywie XXI wieku. Tematem sekcji Wydziału Prawa i Administracji stała się próba odpowiedzi na pytanie o szanse i zagrożenia dla państwa i prawa XXI wieku. Wydaje się, że u progu tego stulecia nie sposób przewidzieć, czego będzie więcej - szans czy zagrożeń. Trudno wyrokować, czy nadchodzące dekady przyniosą nadzieje na pozytywne rozwiązanie problemów, czy też ich eskalacja, a zwłaszcza nowe i trudne do przewidzenia warianty, sprawią, że świat znajdzie się na krawędzi. Nie ma odpowiedzi na te pytania. Jedno jest pewne - jak powiedział Stanisław Lem -płyniemy z nurtem wielkiej rzeki ku nieznanemu oceanowi i znajdujemy się dopiero na początku podróży. Nie ma wątpliwości, że w ostatnim czasie odczuwamy raczej zagrożenie, tym bardziej, że prowadzona walka z terroryzmem nie przynosi oczekiwanych rezultatów. Jednak pesymizmem napawa nie tylko stan międzynarodowego bezpieczeństwa. Również w innych sferach życia dostrzegamy wiele niepokojących zjawisk świadczących o erozji takich fundamentalnych instytucji jak państwo i prawo."(...

Solid-State Dewetting as a Driving Force for Structural Transformation and Magnetization Reversal Mechanism in FePd Thin Films

In this work, the process of solid-state dewetting in FePd thin films and its influence on structural transformation and magnetic properties is presented. The morphology, structure and magnetic properties of the FePd system subjected to annealing at 600 °C for different times were studied. The analysis showed a strong correlation between the dewetting process and various physical phenomena. In particular, the transition between the A1 phase and L10 phase is strongly influenced by and inextricably connected with solid-state dewetting. Major changes were observed when the film lost its continuity, including a fast growth of the L10 phase, changes in the magnetization reversal behavior or the induction of magnetic spring-like behavior