Control of resistance of a magnetoresistive manganite by spin injection

Abstract

Effect of nanosize modulation of granular La 0.67 Sr 0.33 MnO 3 manganites on temperature-dependent lowfield spin-polarized tunneling magnetoresistance

Wet Etching Study of La0.67(Sr0.5Ca0.5)0.33MnO3 Films on Silicon Substrates

“…Alternatively, the pulsed laser method, 13 reactive ion etching (RIE), 14 and focused ion beams (FIB) 15 have also been investigated. Naoe et al reported 14 a more effective etching procedure for CMR La 0.67 Sr 0.33 MnO 3 films using the RIE technique with CO/NH 3 and achieved high etch rates of 15 to 70 nm/min with high selectivity ($4.7) over a Ti metal mask.…”

Photoinduced coherent magnetization precession in epitaxialLa0.67Ca0.33MnO3films

“…5,6 The understanding of the magnetization dynamics in manganite thin films is important for the fastest switching operation of these devices. Several factors, such as the possible normal modes and the damping of the coherent magnetization precession, play a crucial role in achieving reliable switching behavior.…”

Investigation of FIB irradiation damage in La0.7Sr0.3MnO3 thin films

“…It is worthwhile to notice that in Ref. [11] the authors still observe a metal-insulator transition at 150 K, with a dose as large as 9 Â 10 16 ions/cm 2 . The apparent inconsistency with our results is explained in terms of film thickness, that is 50 nm in their case versus 20 nm in our case.…”

“…Also the non-ohmic dependence of measured resistance on the applied current described in Ref. [11] may be a signature of phase separation of metallic ferromagnetic and insulating paramagnetic regions, triggered by the non-homogeneity of the sample along its cross-section [19].…”

“…In particular, FIB patterning is usually performed with two different approaches: one is to remove material by ion milling [9], the other is to change locally the magnetic properties by ion-induced damage at low-dose irradiation, without material erosion. The latter approach has been used to drive a local ferromagnetic to paramagnetic transition in ferromagnetic films [10] and in manganites [11], and to induce easy nucleation regions for magnetisation reversal [12]. Ion-induced damage can be exploited as a tool for nanopatterning but it can also be considered as a drawback to keep into account when the milling approach is performed.…”