Interacting ferromagnetic nanoparticles in discontinuous<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Co</mml:mi></mml:mrow><mml:mrow><mml:mn>80</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>20</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>/</mml:mo><mml:mi mathvariant="normal">A</mml:mi><mml:mi mathvariant="normal">l</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>multilayers: From superspin glass to reentrant superferromagnetism
W. Kleemann, O. Petracic, Ch. Binek, G. N. Kakazeı̆(Universidade do Porto), Yu. G. Pogorelov(Universidade do Porto), J. B. Sousa(Universidade do Porto), Susana Cardoso(Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento), P. P. Freitas(Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento)
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Abstract
Dipolar superferromagnetism with reentrant low-temperature superspin glass behavior is observed on a randomly distributed ferromagnetic nanoparticle systems in discontinuous metal-insulator multilayers $[{\mathrm{Co}}_{80}{\mathrm{Fe}}_{20}(t)/{\mathrm{Al}}_{2}{\mathrm{O}}_{3}(3\mathrm{}\mathrm{n}\mathrm{m}){]}_{10}$ with nominal thickness $1.1<~t<~1.3\mathrm{nm}$ by use of ac susceptometry and dc magnetometry. At $t=1.0\mathrm{nm},$ superspin glass-like freezing is evidenced by the criticality of dynamic and nonlinear susceptibilities.
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