Magnetic order and magnetotransport in half-metallic ferrimagnetic 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Mn</mml:mi><mml:mi>y</mml:mi></mml:msub><mml:msub><mml:mi>Ru</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi>Ga</mml:mi></mml:mrow></mml:math>
 thin films

Siewierska, Katarzyna; Atcheson, Gwenaël; Jha, Ashish Kumar; Esien, Kane; Smith, Ross; Lenne, Simon; Teichert, Niclas; O'Brien, J.C.; Coey, J. M. D.; Stamenov, Plamen; Rode, Karsten

doi:10.1103/physrevb.104.064414

Cited by 12 publications

(7 citation statements)

References 34 publications

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“…The two are frequently referred to as the 'acoustic' or 'ferromagnetic' and 'optical' or 'antiferromagnetic' modes, respectively. In amorphous Gd(FeCo) 3 , axial symmetry is broken by structural inhomogeneity [19] (Gd tends to cluster) whereas in MRG non-collinearity of the ferrimagnetic ground state [20], four-fold sublattice-specific magnetocrystalline anisotropy of opposite signs [21], and preferential absorption by light of one sublattice play the same role. The intense electronic excitation provided by the pump pulse excites a multitude of magnons.…”

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confidence: 99%

Ultrafast Double Pulse All-Optical Reswitching of a Ferrimagnet

et al. 2021

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All-optical re-switching has been investigated in the half-metallic Heusler ferrimagnet Mn 2 Ru 0.9 Ga, where Mn atoms occupy two inequivalent sites in the XA-type structure. The effect of a second 200 fs 800 nm pump pulse that follows a first pulse, when both are above the threshold for switching, is studied as a function of t 12 , the time between them. The aims are to identify the physical mechanisms involved and to determine the minimum time needed for re-switching. The time trajectory of the switching process on a plot of sublattice angular momentum, S 4a vs S 4c , is in three stages; When t < 0.1 ps, the sublattice moments are rapidly disordered, but not destroyed, while conserving net angular momentum via optical spin-wave excitations. This leads to transient parallel alignment of the residual Mn spins in the first quadrant. The net angular momentum associated with the majority sublattice then flips in about 2 ps, and a fully-reversed ferrimagnetic state is then established via the spin-lattice interaction, which allows re-switching provided t 12 > 10 ps.Single-pulse all-optical switching of magnetization (SP-AOS) is of both fundamental and technological interest [1][2][3]. Despite intense scrutiny over the last two decades, the microscopic origin of the effect is still poorly understood, but the possibility of switching the magnetisation of a thin film between two stable states on a picosecond timescale without recourse to an external magnetic field is intriguing and technologically relevant in the quest for ever-faster and more energy-efficient information technologies [4][5][6]. Here we establish the minimum time that must elapse between two pulses, if the second one is to re-establish the original state. Our results advance the fundamental understanding of SP-AOS and highlight its potential for future application in technology.

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confidence: 99%

Ultrafast Double Pulse All-Optical Reswitching of a Ferrimagnet

et al. 2021

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“…We should add that experimentally, concentrations of both Mn and Ru can be already tuned in several different experimental groups. Chatterjee et al 35 were able to adopt two concentrations x = 0.2, 0.5 in Mn 2−x Ru 1+x , while Siewierska et al 34 were able to independently change x and y in Mn y Ru x Ga films. In fact, Banerjee et al 37 already used 13 samples with x = 0.5 up to 1.0 in Mn 2 Ru x Ga. II, provides a crucial insight that demagnetization rates at two Mn spin-sublattices change between region I (between 0 to 0.26 ps) and region II (between 0.26 ps to 5 ps).…”

Section: Discussionmentioning

confidence: 99%

“…In 2014, Kurt et al 26 demonstrated that Ru can significantly reduce the spin moment in ferrimagnet Mn 2 Ru x Ga. Because one can tune composition x, Mn 2 Ru x Ga is likely to be a half-metal and fully-compensated ferrimagnet 27,28 , with no stray field, ideal for spintronics 13,29,30 . Research has intensified immediately 21,[31][32][33][34][35] . Lenne et al 36 found that the spin-orbit torque reaches 10 −11 Tm 2 /A in the low-current limit.…”

Section: Introductionmentioning

confidence: 99%

First-principles insights into all-optical spin switching in the half-metallic Heusler ferrimagnet Mn$_2$RuGa

Zhang,

Bai,

et al. 2022

Preprint

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All-optical spin switching (AOS) represents a new frontier in magnetic storage technologyspin manipulation without a magnetic field, -but its underlying working principle is not well understood. Many AOS ferrimagnets such as GdFeCo are amorphous and renders the high-level first-principles study unfeasible. The crystalline half-metallic Heusler Mn 2 RuGa presents an opportunity. Here we carry out hitherto the comprehensive density functional investigation into the material properties of Mn 2 RuGa, and introduce two concepts -the spin anchor site and the optical active site -as two pillars for AOS in ferrimagnets. In Mn 2 RuGa, Mn(4a) serves as the spin anchor site, whose band structure is below the Fermi level and has a strong spin moment, while Mn(4c) is the optical active site whose band crosses the Fermi level. Our magneto-optical Kerr spectrum and band structure calculation jointly reveal that the delicate competition between the Ru-4d and Ga-4p states is responsible for the creation of these two sites. These two sites found here not only present a unified picture for both Mn 2 RuGa and GdFeCo, but also open the door for the future applications. Specifically, we propose a Mn 2 Ru x Ga-based magnetic tunnel junction where a single laser pulse can control magnetoresistance.

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“…[8][9][10][11][12][13][14][15][16] The common ferrimagnets include rare-earth iron garnets, [17][18][19] rare-earth transition metal alloys, [20][21][22] Mn 4 N-based nitrides, [23,24] and some Mn-based Heusler compounds. [25][26][27][28][29][30][31] By varying the composition, not only can the compensated ferrimagnetic state be achieved, but also T M can be regulated. Cubic Mn 2 Ru x Ga thin film is a typical example of compensated ferrimagnet with high spin polarization and high tunability of T M by freely varying the Ru content x in a broad range (0.3 < x < 1.0).…”

Section: Introductionmentioning

confidence: 99%

Tailoring-compensated ferrimagnetic state and anomalous Hall effect in quaternary Mn–Ru–V–Ga Heusler compounds

Liang 梁,

Xi 郗,

Wang 王

et al. 2024

Chinese Phys. B

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Cubic Mn2Ru x Ga Heusler compound is a typical example of compensated ferrimagnet with attractive potential for high-density, ultrafast, and low-power spintronic applications. In the form of epitaxial thin films, Mn2Ru x Ga was shown to exhibit high spin polarization and high tunability of compensation temperature by freely varying the Ru content x over a broad range (0.3 < x < 1.0). Here, we systematically studied Mn-Ru-Ga-based polycrystalline bulk buttons prepared by arc melting and found that, in equilibrium bulk form, the cubic structure is unstable when x < 0.75. To overcome this limitation, we alloyed Mn-Ru-Ga with a fourth element V. By adjusting the content of V in the Mn2Ru0.75V y Ga and Mn2.25-y Ru0.75V y Ga quaternary systems, the magnetic compensation temperature was regulated. Compensation was achieved near 300 K which was confirmed by both the magnetic and anomalous Hall effect measurements. Analyses of the anomalous Hall effect scaling in quaternary Mn-Ru-V-Ga alloys revealed the dominant role of skew scattering, notably that contributed by the thermally excited phonons, in contrast to many other 3d ferromagnets and Heusler compounds. We further showed that the Ga antisites and V content can simultaneously control the residual resistivity ratio (RRR) as well as the relative phonon and defect contribution to the anomalous Hall effect a’’/a’ in Mn-Ru-V-Ga, leading to a scaling relation a’’/a’ ∝ RRR1.8.

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Magnetic order and magnetotransport in half-metallic ferrimagnetic MnyRuxGa thin films

Cited by 12 publications

References 34 publications

Ultrafast Double Pulse All-Optical Reswitching of a Ferrimagnet

Ultrafast Double Pulse All-Optical Reswitching of a Ferrimagnet

First-principles insights into all-optical spin switching in the half-metallic Heusler ferrimagnet Mn$_2$RuGa

Tailoring-compensated ferrimagnetic state and anomalous Hall effect in quaternary Mn–Ru–V–Ga Heusler compounds

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