Time and field dependence of the magnetization in AuFe, AgMn, and ThGd spin glasses

Oseroff, S. B.; Mesa, Manuel A.; Tovar, M.; Arce, R.

doi:10.1063/1.330819

Cited by 22 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7͑b͒ shows values of (1Ϫn) reported in the literature for several crystalline spin glasses, which were measured at T/T f ͑Ref. 40͒ values ranging from 0.137 to 0.169, 36,41,42 thus close to the value 0.169 used in the present measurements. In general, the present (1Ϫn) values are smaller ͑i.e., slower de-cay͒ than those of crystalline spin glasses.…”

Section: Resultssupporting

confidence: 85%

Paramagnetism, superparamagnetism, and spin-glass behavior in bulk amorphous Pd–Ni–Fe–P alloys

Shen¹,

Schwarz²,

Thompson³

1999

Journal of Applied Physics

View full text Add to dashboard Cite

We have investigated the magnetic properties of bulk amorphous Pd 40 Ni 40Ϫx Fe x P 20 (xϭ0 -17.5) alloys. For Pd 40 Ni 40 P 20 (xϭ0), the magnetic susceptibility consists of temperature-independent and Curie-Weiss-type terms. Alloys with xу5 are paramagnetic at high temperatures. With decreasing temperature, the amorphous alloys become superparamagnetic. At even lower temperatures, and under a weak applied magnetic field, these alloys are spin glasses, as evidenced by static and dynamic magnetic measurements. The spin-freezing temperature increases with increasing iron content and this is attributed to the role of the Ruderman-Kittel-Kasuya-Yosida interaction in creating the spin-glass state. The occurrence of a reentrant spin-glass behavior on cooling ͑superparamagnetism-to-ferromagnetism-to-spin-glass transition͒ is also observed for xϭ17.5 at a field у50 Oe. An unexpected result is that the ferromagnetic state in the present bulk metallic glasses is field induced. Evidence for the field-induced ferromagnetic-like order is obtained from ͑a͒ straight regions in the susceptibility versus temperature curves measured at various fields, ͑b͒ an Arrott plot, and ͑c͒ time-independent magnetization. With increasing applied field, the spin-freezing temperature decreases and the Curie temperature increases, broadening the temperature range of the field-induced ferromagnetic-like state. The temporal decay of the thermoremanent magnetization in the amorphous alloy with xϭ17.5 is slower than that in typical crystalline spin glasses. The spin-freezing temperature of the amorphous alloy with xϭ17.5 decreases approximately logarithmically with applied field, which differs from the prediction of Néel's model for spin glasses.

show abstract

Section: Resultssupporting

confidence: 85%

Paramagnetism, superparamagnetism, and spin-glass behavior in bulk amorphous Pd–Ni–Fe–P alloys

Shen¹,

Schwarz²,

Thompson³

1999

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…20,21 Early decay measurements of TRM of spin-glasses had shown logarithmic dependence. 22 Similar dependence was also observed in AuFe, AgMn, ThGd spin-glasses from 5 to 10 4 s. 23 Analysing the neutron diffraction and ac susceptibility data, Murani 24 found power law decay for shorter time and logarithmic decay for longer time below T g in SG. Bontemps and Orbach 25 measured the TRM of the insulating SG Eu 0.4 Sr 0.6 S between 0.86T g and 1.04T g .…”

Section: Introductionmentioning

confidence: 56%

Relaxation of thermo-remanent magnetization in different magnetic phases of Fe-rich γ-FeNiCr alloys

Sinha

Chatterjee

Uehara

et al. 1996

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

The time decay of the thermoremanent magnetization(TRM) of the Fe 80−x Ni x Cr 20 (14 ≤ x ≤ 30) alloys has been measured for four different magnetic phases within the fcc γ-phase using a SQUID magnetometer. In the spin-glass phase(SG)(X=19) very distinct ageing effects are observed where M(t) can be described as M (t) = M 0 (t/t w ) −γ exp[−(t/τ ) 1−n ] for the entire time domain. In the reentrant spin-glass(RSG)(X= 23 and 26), M(t) can be better represented by the stretched exponential with an addition of a constant term which can be well explained by the Gabay-Toulouse(GT) model.We have also measured the linear and non-linear ac susceptibilities for the sample X=23 and confirmed the presence of the ferromagnetic(FM) ordering down to the lowest temperature. In the RSG(X=23), the TRM shows a minimum near T c and a local maximum just above T c . In the FM phase (X=30) the popular prediction of the power law decay of the TRM is observed. The latter is indistinguishable from the stretched exponential in the antiferromagnetic(AF) phase (X=14).

show abstract

“…Several authors argued an advantage of a particular description of the ESR data and physical meaning of the parameters [6][7][8]. However, no consensus was reached which of the approaches is "the correct one" [2].…”

Section: Temperature Dependence Of the Line Widthmentioning

confidence: 99%

“…The similar value of the critical temperature was also obtained from the Dormann and Jaccarino formula. However, the Curie-Weiss temperature of 0.15 K obtained from the fit is too small [6]. Formally the best fit to the data (the smallest standard deviation) was obtained with the empirical Bhagat formula but with the 18.2 K critical temperature.…”

Section: Temperature Dependence Of the Line Widthmentioning

confidence: 99%

“…The molecular beam epitaxy grown CdTe/CdMnTe MQW system (CΤ411) was grown on (100) CdTe with 6000 Á thick CdMnTe buffer and consisted of 6 CdTe quantum wells of different thicknesses (6,12,18,28, 60 and 100 Å) separated by 500Å Cd1-x M n x T e barriers and was covered with 1000 11 thick CdMnTe upper layer. The CT608a sample consisted of a single 2 µ m CdMnTe layer grown on (100) CdTe substrate separated by 2000 Å. CdTe buffer.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

ESR Study of the Magnetic Properties of the CdTe/CdMnTe Multi Quantum Wells

1993

View full text Add to dashboard Cite

The results of electron spin resonance investigations of bulk Cd1-xMnx Τ e and of molecular beam epitaxy grown CdTe/CdMnTe single 2 µm thick layer and multi quantum well with Mn concentrations of about x = 0.10 are compared. The Mn 2+ electron spin resonance spectrum of the MQW CdTe/CdMnTe shows severalfeatures different from those observed in the CdMnTe bulk sample.The Mn2+ resonance shows a small anisotropy of position and widthwith the anisotropy axis normal to the heterointerface. Tle temperature dependence of the width of the electron spin resonance line is also different from that observed for the bulk and for the thick single layer.

show abstract

Time and field dependence of the magnetization in AuFe, AgMn, and ThGd spin glasses

Cited by 22 publications

References 10 publications

Paramagnetism, superparamagnetism, and spin-glass behavior in bulk amorphous Pd–Ni–Fe–P alloys

Paramagnetism, superparamagnetism, and spin-glass behavior in bulk amorphous Pd–Ni–Fe–P alloys

Relaxation of thermo-remanent magnetization in different magnetic phases of Fe-rich γ-FeNiCr alloys

ESR Study of the Magnetic Properties of the CdTe/CdMnTe Multi Quantum Wells

Contact Info

Product

Resources

About