Influence of the growth technique on the coupling and magnetoresistance of Co/Ru sandwiches

Anomalous codeposition of cobalt and ruthenium from chloride–sulfate baths

“…The GMR achieved was about 0.1 % only in Co/Ru multilayers prepared by either physical [18][19][20] or electrochemical [16] methods. Regardless of the preparation technique of the Co/Ru sandwich structures, a significant intermixing of the layers was observed [20], which can be attributed to the complete miscibility of Co and Ru in a hexagonal phase [21]. It is of particular interest whether the relatively low preparation temperature during electrodeposition may help to prevent the intermixing of Co and Ru.…”

“…The latter feature is a crucial factor in achieving giant magnetoresistance (GMR) in magnetic/non-magnetic multilayers, especially in the Co/Ru system where the largest coupling strength was measured [17]. The GMR achieved was about 0.1 % only in Co/Ru multilayers prepared by either physical [18][19][20] or electrochemical [16] methods. Regardless of the preparation technique of the Co/Ru sandwich structures, a significant intermixing of the layers was observed [20], which can be attributed to the complete miscibility of Co and Ru in a hexagonal phase [21].…”

Magnetic, transport and structural properties of Co/Ir multilayers grown by molecular beam epitaxy

“…The magnetisation major loop is pre- sented in Fig. 6 and shows the presence of a high saturation field (22 kOe), which is approximately 10 times larger than the value observed for sandwiches deposited by IBS technique (2.5 kOe) [17]. This is the first consequence of the well defined crystalline structure.…”

“…In these conditions, high saturation and plateau fields are expected [17]. In order to verify such hypothesis and to reach the saturation field of the AFi, SQUID magnetic measurements were performed at room temperature on an antiferromagnetically coupled Co 15 /Ir 5 /Co 30 (Å) sandwich.…”

Structural Studies of Co/Cu and Co/Ru Interfaces Using59Co NMR Method

“…In spite of that, the giant magnetoresistance (GMR) effect is very low in these materials, which has been attributed to a considerable interdiffusion of interfaces [2], or to a small difference between the spin-polarized density of states at the Fermi level [3]. With the aim to improve the magnetotransport properties -GMR higher with respect to Co/Ru multilayers and magnetoresistive hysteresis smaller than that observed in Co/Cu multilayers at 2nd maximum of antiferromagnetic coupling (2nd AFM) -we have prepared a heterostructure with the following layer sequence: [Cο(20 Å)/Ru(19 Α)/Cox(20 Α)/Cu(21 R)] 10, grown on 100Å Ru buffer.…”