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- W2051247101 abstract "An experimental evidence of the progressive modification in the magnetic behavior of granular $text{Fe}/{text{Si}}_{3}{text{N}}_{4}$ samples due to interaction effects between particles is reported. Microstructural features and local structure were determined by x-ray absorption spectroscopy and transmission electron microscopy to select granular samples with predetermined cluster size. $text{Fe}/{text{Si}}_{3}{text{N}}_{4}$ systems have been characterized by ac- and dc-magnetization measurements to study the gradual evolution of magnetic properties of granular systems, where three different behaviors have been observed. As-deposited samples with Fe thickness layers of 2.5 nm, present a modified superparamagnetic behavior, due to very weak interactions between very small Fe clusters separated by a nonmagnetic FeN phase. An evolution of the average blocking temperature at intermediate fields $({T}_{text{B}}ensuremath{sim}{H}^{3/2})$ is observed, similar to noninteracting systems, but first signatures of a frozen spin state at low temperatures appear. Annealed samples exhibit a noticeable modification from the multilayer character to a random three-dimensional organization of Fe clusters embedded in a ${text{Si}}_{3}{text{N}}_{4}$ matrix. After annealing, samples with initial Fe layer thickness of 0.7 nm provide iron cluster in the range of 1.3 nm and exhibit a superspin-glass state, with a de Almeida-Thouless evolution of the energy barriers $({T}_{text{B}}ensuremath{sim}{H}^{2/3})$ that is explained in terms of increasing interparticle interactions. Moreover, annealed samples, with initial layer thickness of 1.3 nm, supply iron cluster of near 3 nm that present stronger interactions and yield a superferromagnetic state, likely provided by residual ultrasmall particles between the blocked clusters." @default.
- W2051247101 created "2016-06-24" @default.
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- W2051247101 date "2010-10-08" @default.
- W2051247101 modified "2023-10-17" @default.
- W2051247101 title "Effects of interparticle interactions in magnetic<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mtext>Fe</mml:mtext><mml:mo>/</mml:mo><mml:msub><mml:mrow><mml:mtext>Si</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mtext>N</mml:mtext><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>granular systems" @default.
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- W2051247101 doi "https://doi.org/10.1103/physrevb.82.134413" @default.
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