Tunable thermal hysteresis in CoGd alloys

Abstract

We show that tunable magnetic thermal hysteresis can be realized for a simple ferrimagnetic CoGd alloy. The magnetization of a Co0.8Gd0.2 alloy shows a bow-tie curve as a function of temperature, which indicates supercooled and superheated phase transitions. The width of the magnetic thermal hysteresis can be tuned by an external magnetic field, with values of 190 K at fields near 100 Oe and values of 20 K near 400 Oe. Experimental results are in reasonable agreement with theoretical calculations.

Ferromagnetism of Dy films containing embedded Fe atoms and nanoparticles

“…On heating the film in the applied field the FM state is observed to persist to room temperature. Thermal hysteresis in RE/TM samples has been reported previously both in multilayers and alloys [14,15] and the giant effect observed here is discussed in Section 4. The behaviour demonstrated in a pure polycrystalline sample provides a simple environment, that is, FM or PM, in which to understand the behaviour of embedded Fe nanoparticles.…”

Spin wave ballistic transport properties of [Co1−cGdcAshokan1, Khater2, Ghantous3 et al. 2015Journal of Magnetism and Magnetic Materials10060View full textAdd to dashboardCite

“…There is in contrast a considerable literature on the structure and ferrimagnetic properties of R-T magnetic multilayers [8][9][10][11][12][13], thanks to the progress of thin film techniques. This situation heralds the possible preparation of nanojunctions from R-T nanomaterials for promising applications in spintronics and magnonic devices.…”

Thermal hysteresis of interface biased ferromagnetic dots

“…Recent results include studies of rare-earth and/or transition-metal multilayers, 6,7 experimental work on ferromagnetic-antiferromagnetic exchange bias structures, 8 and experimental and theoretical work on alloys and compounds. [9][10][11] Recently, we performed a theoretical study of thermal hysteresis in thin Dy films in the 80-179 K temperature interval. 12 The thermal hysteresis originates in the combined effect of the strong temperature dependence of the magnetization, the hexagonal anisotropy of Dy, and the modifications of the helical phase imposed by surface effects.…”