Anomalous Hall hysteresis in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">T</mml:mi><mml:msub><mml:mi mathvariant="normal">m</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi mathvariant="normal">F</mml:mi><mml:msub><mml:mi mathvariant="normal">e</mml:mi><mml:mn>5</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>12</mml:mn></mml:msub><mml:mrow><mml:mtext>/</mml:mtext><mml:mi>Pt</mml:mi></mml:mrow></mml:mrow></mml:math>with strain-induc

Tang, Chi; Sellappan, Pathikumar; Liu, Yawen; Xu, Yadong; Garay, Javier E.; Shi, Jing

doi:10.1103/physrevb.94.140403

Cited by 124 publications

(91 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is the strongest evidence for MPE in Pt/CFO in our study. Such an AMR signature has never been observed in previous studies of Pt/CFO, but it has been previously reported for other Pt/FMI systems and is accepted as the most reliable test among transport measurements for MPE [22][23][24]. We also perform the β-scan and observe SMR with similar magnitude as reported in previous studies [16][17][18]20] The Hall resistivity ρ xy in Figure 3a can come from two sources as shown in Equations (1) and (2):…”

supporting

confidence: 78%

Magnetic proximity effect in Pt/CoFe2O4 bilayers

Amamou

Pinchuk

Trout

et al. 2018

Phys. Rev. Materials

View full text Add to dashboard Cite

We observe the magnetic proximity effect (MPE) in Pt/CoFe 2 O 4 bilayers grown by molecular beam epitaxy (MBE). This is revealed through angle-dependent magnetoresistance measurements at 5 K, which isolate the contributions of induced ferromagnetism (i.e. anisotropic magnetoresistance) and spin Hall effect (i.e. spin Hall magnetoresistance) in the Pt layer. The observation of induced ferromagnetism in Pt via AMR is further supported by density functional theory calculations and various control measurements including insertion of a Cu spacer layer to suppress the induced ferromagnetism. In addition, anomalousHall effect measurements show an out-of-plane magnetic hysteresis loop of the induced ferromagnetic phase with larger coercivity and larger remanence than the bulk CoFe 2 O 4 . By demonstrating MPE in Pt/CoFe 2 O 4 , these results establish the spinel ferrite family as a promising material for MPE and spin manipulation via proximity exchange fields.* equal contributions **email: kawakami.15@osu.edu 2 Spin manipulation inside a nonmagnetic (NM) material using internal effective fields (spin orbit or exchange) is a very promising avenue toward the realization of next generation spintronic devices (spin transistors, magnetic gates, etc.) [1,2]. In particular, magnetic proximity effect (MPE) at the interface of a NM spin channel and a ferromagnetic insulator (FMI) is of great importance for generating exchange fields and induced ferromagnetism in the NM layer. Recently, spin manipulation by MPE has been realized in experiments that modulate spin currents in graphene on YIG (yttrium iron garnet) [3,4]. In addition, proximity exchange fields induced by FMI have been observed for graphene and monolayer transition transition metal dichalcogenides [5,6].Among FMIs, members of the spinel ferrite family (MFe 2 O 4 , with M=Co, Ni, etc.) are attractive because their magnetic properties can be tuned by alloy composition [7,8] as well as epitaxial strain [9][10][11]. In particular, CoFe 2 O 4 (CFO) is a hard ferrimagnetic insulator which exhibits high Curie temperature (728 K), spin-filtering properties [12][13][14], magneto-electric switching [15], and is readily integrated with practical spintronic materials (MgO, Fe, Cr). Unfortunately, all previous experiments have failed to observe MPE using CFO. To test for MPE in NM/FMI systems, Pt is widely used as the NM material due its closeness to fulfilling the Stoner criteria and thus allowing it to become ferromagnetically ordered at the interface with the FMI. Initial studies of Pt/CFO grown by pulsed laser deposition (PLD) utilized magnetotransport measurements and observed no MPE in the Pt layer [16]. Subsequent transport and element-specific magnetization measurements by x-ray magnetic circular dichroism (XMCD) also found no evidence for induced ferromagnetism in the Pt layer [17][18][19][20] contributing to a growing consensus that CFO cannot be used to obtain MPE. However, because the length scale of exchange interactions is on the order of angstroms, it should...

show abstract

supporting

confidence: 78%

Magnetic proximity effect in Pt/CoFe2O4 bilayers

Amamou

Pinchuk

Trout

et al. 2018

Phys. Rev. Materials

View full text Add to dashboard Cite

show abstract

“…Very recently, ultra-thin MI films showing PMA have been the subject of an increasing interest: 15,16 Tm 3 Fe 5 O 12 or BaFe 12 O 19 (respectively a garnet and an hexaferrite) have been used to demonstrate spin-orbit-torque magnetization reversal using a Pt over-layer as a source of spin current 4,17,18 . However, their large magnetic losses prohibit their use as a spin-wave medium (reported value of μ 0 Δ H pp of TIG is 16.7 mT at 9.5 GHz) 19 . Hence, whether it is possible to fabricate ultra-low loss thin films with a large PMA that can be used for both magnonics and spintronics applications remains to be demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Ultra-low damping insulating magnetic thin films get perpendicular

Soumah¹,

Beaulieu²,

Qassym³

et al. 2018

Nat Commun

177

108

View full text Add to dashboard Cite

A magnetic material combining low losses and large perpendicular magnetic anisotropy (PMA) is still a missing brick in the magnonic and spintronic fields. We report here on the growth of ultrathin Bismuth doped Y3Fe5O12 (BiYIG) films on Gd3Ga5O12 (GGG) and substituted GGG (sGGG) (111) oriented substrates. A fine tuning of the PMA is obtained using both epitaxial strain and growth-induced anisotropies. Both spontaneously in-plane and out-of-plane magnetized thin films can be elaborated. Ferromagnetic Resonance (FMR) measurements demonstrate the high-dynamic quality of these BiYIG ultrathin films; PMA films with Gilbert damping values as low as 3 × 10−4 and FMR linewidth of 0.3 mT at 8 GHz are achieved even for films that do not exceed 30 nm in thickness. Moreover, we measure inverse spin hall effect (ISHE) on Pt/BiYIG stacks showing that the magnetic insulator’s surface is transparent to spin current, making it appealing for spintronic applications.

show abstract

“…Other thin film RE garnets include GdIG (Gd 3 Fe 5 O 12 ) [25] and LuIG (Lu 3 Fe 5 O 12 ) [26] with in plane easy axis. Out of the PMA RE garnets, TmIG is the most extensively studied in terms of the spintronic properties of the FMI/HM interface [19,[27][28][29][30]. TmIG/HM devices exhibited SOT-driven reversal with applied fields as low as 2 Oe and evidence of fast current-induced domain wall velocities reaching 1000 m/s at a current density of 2.5 × 10 12 A/m 2 in the Pt [28].…”

Section: Introductionmentioning

confidence: 99%

“…The origin of the AHE in Pt/ferrite interfaces is a hotly debated topic, with some arguing that it is at least partly due to the magnetic proximity effect (MPE) [30,48] while others maintain that it is fully due to a spin Hall magnetoresistance (SMR) effect [5,49]. Meanwhile, measurements of the magnetic polarization of Pt in direct contact with a magnetic insulator using x-ray methods indicate that the MPE is negligibly small at room temperature [50][51][52][53].…”

Section: Spintronic Interface Propertiesmentioning

confidence: 99%