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Study of the low-field irreversibility line in the transverse component spin-glass phase of the amorphous Fe90Zr10 alloy
Amorphous Fe x Zr 100− x alloys display a complex magnetic phase diagram, particularly in the range 89% ≲ x ≲ 93% in which the phase transition from the paramagnetic to a soft ferromagnetic (FM) state at a critical temperature T c precedes a second transition at T xy < T c to a transverse spin-gl...
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Published in: | The European physical journal. B, Condensed matter physics Condensed matter physics, 2020-08, Vol.93 (8), Article 149 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
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Summary: | Amorphous Fe
x
Zr
100−
x
alloys display a complex magnetic phase diagram, particularly in the range 89% ≲
x
≲ 93% in which the phase transition from the paramagnetic to a soft ferromagnetic (FM) state at a critical temperature
T
c
precedes a second transition at
T
xy
<
T
c
to a transverse spin-glass (SG) phase, with frozen spin components transverse to the magnetization. The softness of the FM phase and the coexistence of FM and SG orderings complicate exploring the low-temperature and low-field critical properties of the glassy transition. Here we study the irreversibility Almeida-Thouless (AT) line that marks the onset of the transverse SG phase in the Fe
90
Zr
10
alloy in the low-field regime up to
H
= 60 Oe. While ZFC measurements give rise to an AT exponent
ϕ
= 4.6, similar to that of another amorphous FM compound with random local anisotropy, the induction of magnetic shiftings upon cooling the sample in a large field, − 85 kOe, displaces down the AT line and separates it into two distinct regimes: one also with
ϕ
= 4.6 for
H
above 20 Oe, nearly corresponding to the typical field to flip the remanent magnetization, and a new second regime at lower
H
, with field-induced remanent clusters and exponent
ϕ
= 3.6 that approaches the mean-field value
ϕ
= 3. Our findings are discussed on the light of the results from a random nonuniform anisotropy model with FM exchange interactions, which also reported the existence of a two-regimes scenario in the AT line with similar exponents.
Graphical abstract |
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ISSN: | 1434-6028 1434-6036 |
DOI: | 10.1140/epjb/e2020-10086-5 |