Zero-Field-Cooled Magnetization and Coercivity of Itinerant Ferromagnet SrRuO3

Abstract

Subject classification: 75.60.Ej; 75.50Dd Itinerant ferromagnetic SrRuO 3 with a Curie temperature T C ¼ 160:7 K was prepared by a conventional solid reaction method. Its zero-field-cooled (ZFC) magnetization and field-cooled (FC) magnetization were measured over a temperature interval from 5-180 K, in a sequence of applied fields up to coercivity. The major hysteresis loops were measured over a range of temperatures, which span the ordered phase. An empirical model was proposed to analyze the ZFC behaviors by means of coercivities at different temperatures. The calculated ZFC magnetization is consistent with the measured ZFC magnetization. Different ZFC magnetization behaviors were explained by using this model. The results indicate that the various ZFC behaviors originate from the comparison between the temperature dependence of FC magnetization and that of coercivity.

Tunable Ferromagnetic Transition Temperature and Vertical Hysteretic Shift in SrRuO3 Films Integrated on Si(001)

“…Figure a illustrates the zero-field-cooled (ZFC) and field-cooled (FC) magnetization as a function of temperature for the SRO films. Similar to that found for SRO bulk and thin films, , a pronounced magnetic irreversibility was observed between the ZFC and FC curves at H = 100 Oe for all of the SRO films. The large splitting between the ZFC and FC magnetization below T C suggests the existence of a huge MCA in these systems. , The FC magnetization data near T C are fitted with the scaling law M ∝ ( T C – T ) β (see the red line in Figure a), where M is spontaneous magnetization and β is the critical exponent.…”

“…The large splitting between the ZFC and FC magnetization below T C suggests the existence of a huge MCA in these systems. 33,35 The FC magnetization data near T C are fitted with the scaling law M ∝ (T C − T) β (see the red line in Figure 4a), 36 where M is spontaneous magnetization and β is the critical exponent. The β value of the SRO film for P O 2 = 15 Pa is ∼0.6, close to that of the SRO single crystal (∼0.5), 37 and thus can be interpreted based on the mean field model.…”

Oxygen defect assisted paramagnetic to ferromagnetic conversion in Fe doped TiO2nanoparticles

“…51 The temperature of irreversibility and the difference in the magnetization in the two curves is inuenced by the applied magnetic eld, magnetic anisotropy present in the system and the approach by which the ZFC and FC measurement is carried out. [52][53][54] In FC mode a magnetic eld of 500 Oe is applied at 300 K and then the magnetization is measured while cooling down the sample back to 5 K. The applied magnetic eld overcomes the anisotropy present in the system and the spins present in the Fe 3+ and in the oxygen vacancies (F + center) are locked in the direction of the applied magnetic eld. Since no magnetic eld is applied in the ZFC process, while going down from 300-5 K, the magnetic spins in the dopants and in the defects are randomly oriented.…”

“…Even though magnetic eld is applied at low temperature, this eld is not strong enough to overcome the anisotropy barrier and this anisotropy eld restricts the domain wall movement in the direction of the applied magnetic eld and thus, a lower ZFC magnetization in comparison to FC magnetization is observed. 52,53 The inverse susceptibility as a function of temperature is shown in the inset of Fig. 8b.…”

Structural, electrical, and magnetic properties of SrRuO3 thin films

“…19 Oe for 100 nm to 463.54 Oe for 25 nm film at 10 K is in agreement with the ZFC peak positions. 30 Coercivity of the thinner films decreases so sharply that they start resembling double step loop. The double shift magnetization loop structure can appear when the exchange bias anisotropies are present in the system.…”