Reentrant spin-glass behavior in Fe?Zr?B amorphous alloys

Barquı́n, L. Fernández; Sal, J.C. Gómez; Gorría, P.; Garitaonandia, J. S.

doi:10.1016/j.jnoncrysol.2003.08.019

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…This diagram resembles that of a re-entrant spin glass (see for example [14]) where the system evolves from a paramagnetic state to a ferromagnetic one, and finally to a spin-glass-like state as the temperature decreases. The shape of the ZFC/FC curves of the present sample is very similar to that observed in the case of magnetically disordered systems, such as solid solutions or amorphous alloys [5,6,14,[40][41][42][43]. Chien et al [44] observed that Fe-Ag amorphous alloys with Fe concentrations around 45-50 at.% became paramagnetic above a Curie temperature in the range 200-250 K, close to T P2 .…”

Section: Magnetization Resultssupporting

confidence: 83%

Interfacial magnetic coupling between Fe nanoparticles in Fe–Ag granular alloys

Alonso¹,

Fdez-Gubieda²,

Sarmiento³

et al. 2011

Nanotechnology

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The role of the interface in mediating interparticle magnetic interactions has been analysed in Fe50Ag50 and Fe55Ag45 granular thin films deposited by the pulsed laser deposition technique (PLD). These samples are composed of crystalline bcc Fe (2–4 nm) nanoparticles and fcc Ag (10–12 nm) nanoparticles, separated by an amorphous Fe50Ag50 interface, occupying around 20% of the sample volume, as determined by x-ray diffraction (XRD), x-ray absorption spectroscopy (XAS), and high resolution transmission electron microscopy (HRTEM). Interfacial magnetic coupling between Fe nanoparticles is studied by dc magnetization and x-ray magnetic circular dichroism (XMCD) measurements at the Fe K and Ag L2,3 edges. This paper reveals that these thin films present two magnetic transitions, at low and high temperatures, which are strongly related to the magnetic state of the amorphous interface, which acts as a barrier for interparticle magnetic coupling.

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Section: Magnetization Resultssupporting

confidence: 83%

Interfacial magnetic coupling between Fe nanoparticles in Fe–Ag granular alloys

Alonso¹,

Fdez-Gubieda²,

Sarmiento³

et al. 2011

Nanotechnology

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“…3), suggest spin-glass-like behavior occurring at low temperature, in this material. 39,40 Since the 70th, ac susceptibility measurements are used to study spin-glass-like transitions. Indeed, applying a sinusoidal magnetic field to a magnetic material, at a given frequency, will induce a magnetic answer also sinusoidal.…”

Section: Low Temperature Cluster-glass Behavior Of Melt-spun Gd 60 Mnmentioning

confidence: 99%

“…These features are those of clusterglass (re-entrant spin-glass) magnetism, characterized by magnetic relaxation phenomena when entering into the low temperature cluster-glass state from a higher temperature ferromagnetic state. 40 In the case of amorphous materials, the critical slowing down observed close to the re-entrant temperature T RSG presents a difficult quantitative evaluation compared to canonical spin-glasses as it reflects the behavior of several clusters that vary in size and probably in composition. Still, an approximated T RSG of 35 K was determined, according to Mydosh,39 as the maximum slope of the v'' peak attributed to the cluster glass transition; given that the two peaks of cluster glass and ferromagnetic transitions cannot be well separated on the v' curve.…”

Section: Low Temperature Cluster-glass Behavior Of Melt-spun Gd 60 Mnmentioning

confidence: 99%

Tunable magnetocaloric effect in Gd-based glassy ribbons

Mayer¹,

Gorsse²,

Ballon³

et al. 2011

Journal of Applied Physics

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Articles you may be interested inTheoretical description of magnetocaloric effect in the shape memory alloy exhibiting metamagnetic behavior J. Appl. Phys. 119, 013902 (2016) The series of glassy ribbons Gd 60 M 30 In 10 (M ¼ Mn, Co, Ni, Cu) was synthesized by melt-spinning. The change of transition element M in these Gd-based metallic glasses was proven to induce huge variations of the Curie temperature T C , magnetic entropy change peak values DS m peak , and widths at half maximum values of the magnetic entropy change dT. When M is non magnetic (M ¼ Co, Ni, Cu), the samples behave similarly: they display high values of DS m peak (between -6.6 and -8.2 J/kg K in a magnetic field variation of 4.6 T), average dT values (between 77 and 120 K) and no magnetic hysteresis. On the contrary, when M carries a magnetic moment (M ¼ Mn), some irreversibility appears at low temperature, DS m peak is lower (only 3.1 J/kg K for l 0 H ¼ 4.6 T) and the magnetic transition is very large (dT ¼ 199 K for l 0 H ¼ 4.6 T). These features are explained by some antiparallel coupling between Mn atoms randomly located in the metallic glass. This leads to the occurrence of a cluster-glass behavior at low temperature (35 K), following the ferromagnetic transition observed at 180 K when the temperature is decreased. Also, power law fittings of DS m peak and dT versus l 0 H were performed and show that dT is less field dependent than DS m peak . We could then identify an interesting way of improving the refrigeration capacity of the material at low magnetic field.

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