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Low-temperature anomalies in muon spin relaxation of solid and hollow gamma-Fe2O3 nanoparticles : A pathway to detect unusual local spin dynamics
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- Basini, M. (författare)
- Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Univ Milan, INSTM, I-20133 Milan, Italy.;Stockholm Univ, Dept Phys, S-10691 Stockholm, Sweden.
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- Sanna, S. (författare)
- Univ Bologna, Dept Phys & Astron A Righi, I-40127 Bologna, Italy.
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- Orlando, T. (författare)
- Univ Pavia, Dipartimento Fis, Ist Nazl Fis Nucl, I-27100 Pavia, Italy.;Univ Pavia, INSTM, I-27100 Pavia, Italy.;Max Planck Inst Biophys Chem, D-37077 Gottingen, Germany.
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- Univ Milan, Dipartimento Fis, I-20133 Milan, Italy;Univ Milan, INSTM, I-20133 Milan, Italy.;Stockholm Univ, Dept Phys, S-10691 Stockholm, Sweden. Univ Bologna, Dept Phys & Astron A Righi, I-40127 Bologna, Italy. (creator_code:org_t)
- American Physical Society (APS), 2020
- 2020
- Engelska.
- Ingår i: Physical Review B. - : American Physical Society (APS). - 2469-9950 .- 2469-9969. ; 102:19
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- By means of muon spin relaxation measurements we unraveled the temperature spin dynamics in monodisperse maghemite spherical nanoparticles with different surface to volume ratio, in two samples with a full core (diameter D similar to 4 and D similar to 5 nm) and one with a hollow core (external diameter D similar to 7.4 nm). The behavior of the muon longitudinal relaxation rates as a function of temperature allowed us to identify two distinct spin dynamics. The first is well witnessed by the presence of a characteristic peak for all the samples around the so-called muon blocking temperature T-B(mu+). A Bloembergen-Purcell-Pound (BPP)-like model reproduces the experimental data around the peak and at higher temperatures (20 < T < 100 K) by assuming the Neel reversal time of the magnetization as the dominating correlation time. An additional dynamic emerges in the samples with higher surface to volume ratio, namely, full 4 nm and hollow samples. This is witnessed by a shoulder of the main peak for T < 20 K at low longitudinal field (mu H-0 approximate to 15 mT), followed by an abrupt increase of the relaxation rate at T < 10 K, which is more evident for the hollow sample. These unusual anomalies of the longitudinal relaxation rate for T < T-B(mu+) are suggested to be due to the surface spins' dynamical behavior. Furthermore, for weak applied longitudinal magnetic field (mu H-0 approximate to 15 mT) and T < T-B(mu+) we observed damped coherent oscillations of the muon asymmetry, which are a signature of a quasistatic local field at the muon site as probed by muons implanted in the inner magnetic core of the nanoparticles. The muon spin relaxation technique turns out to be very successful to study the magnetic behavior of maghemite nanoparticles and to detect their unusual local spin dynamics in low magnetic field conditions.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- Basini, M.
- Sanna, S.
- Orlando, T.
- Bordonali, L.
- Cobianchi, M.
- Arosio, P.
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- Mariani, M.
- Peddis, D.
- Bonanni, V
- Mathieu, Roland
- Kalaivani, T.
- Singh, G.
- Larionova, J.
- Guari, Y.
- Lartigue, L.
- Lascialfari, A.
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