Strain-modulated helimagnetism and emergent magnetic phase diagrams in highly crystalline MnP nanorod films

Madhogaria, Richa Pokharel; Hung, Chang-Ming; Muchharla, Baleeswaraiah; Duong, Anh Tuan; Das, Raja; Huy, Phạm Thành; Cho, Sunglae; Witanachchi, Sarath; Srikanth, H.; Phan, Manh‐Huong

doi:10.1103/physrevb.103.184423

Cited by 6 publications

(6 citation statements)

References 39 publications

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“…In other words, for the OOP (IP) configuration, the TS scans probe the dynamics of the IP (OOP) spins. [ 33 ] Hence, we identify the effective anisotropy fields for the IP (OOP) configurations as

H_{normalK}^{eff}

H_{normalK}^{OOP}

(

H_{normalK}^{IP}

). Figure 3d–f exhibits the temperature evolution of the IP and OOP anisotropy fields, that is,

H_{normalK}^{IP} (T)

and

H_{normalK}^{OOP} (T)

, respectively in the temperature range 100 K ≤ T ≤ 300 K. It is evident that

H_{normalK}^{IP}

H_{normalK}^{OOP}

for all the GdIG(t)/GGG films above and below T Comp , whereas, for the GdIG(31 nm)/GSGG film,

H_{normalK}^{IP}

H_{normalK}^{OOP}

for T ≥ T Comp but,

H_{normalK}^{IP}

H_{normalK}^{OOP}

for T < 200 K .…”

Section: Resultsmentioning

confidence: 99%

“…This implies that higher (lower) field is required to rotate the IP (OOP) spins when the DC bias field is applied along the OOP (IP) directions for the GdIG(t)/GGG films. [ 33 ] In other words, the GdIG(t)/GGG films exhibit IP anisotropy for all temperatures. However, the magnetic easy axis for the GdIG (31 nm)/GSGG film transforms from OOP for T ≥ T Comp to IP for T < 200 K .…”

Section: Resultsmentioning

confidence: 99%

“…, respectively in the temperature range 100 K ≤ T ≤ 300 K. It is evident that H K IP > H K OOP for all the GdIG(t)/GGG films above and below T Comp , whereas, for the GdIG(31 nm)/ GSGG film, H K IP < H K OOP for T ≥ T Comp but, H K IP > H K OOP for T < 200 K. This implies that higher (lower) field is required to rotate the IP (OOP) spins when the DC bias field is applied along the OOP (IP) directions for the GdIG(t)/GGG films. [33] In other words, the GdIG(t)/GGG films exhibit IP anisotropy for all temperatures. However, the magnetic easy axis for the GdIG (31 nm)/GSGG film transforms from OOP for T ≥ T Comp to IP for T < 200 K. This is consistent with our magnetometry results.…”

Section: Magnetization and Effective Magnetic Anisotropymentioning

confidence: 95%

“…In other words, for the OOP (IP) configuration, the TS scans probe the dynamics of the IP (OOP) spins. [33] Hence, we identify the effective anisotropy fields for the IP (OOP) configurations as…”

Section: Magnetization and Effective Magnetic Anisotropymentioning

confidence: 99%

See 3 more Smart Citations

Scaling of the Thermally Induced Sign Inversion of Longitudinal Spin Seebeck Effect in a Compensated Ferrimagnet: Role of Magnetic Anisotropy

Chanda

Holzmann

Schulz

et al. 2021

Adv Funct Materials

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The authors report on a systematic investigation of the longitudinal spin Seebeck effect (LSSE) in a GGG(Gd3Ga5O12)/GdIG(Gd3Fe5O12)/Pt film series exhibiting an in‐plane magnetic easy axis with a compensation temperature (TComp) that decreases from 270 to 220 K when decreasing GdIG film thickness from 272 to 31 nm, respectively. For all the films, the LSSE signal flips its sign below TComp. The authors demonstrate a universal scaling behavior of the temperature dependence of LSSE signal for the GdIG films around their respective TComp. Additionally, the authors demonstrate LSSE in a 31 nm GdIG film grown on a lattice‐mismatched GSGG (Gd3Sc2Ga3O12) substrate that exhibits an out‐of‐plane magnetic easy axis at room temperature. However, this sample reveals a spin reorientation transition where the magnetic easy axis changes its orientation to in‐plane at low temperatures. A clear distinction is observed in the LSSE signal for the GSGG/GdIG(31 nm)/Pt heterostructure, relative to GGG/GdIG(31 nm)/Pt showing an in‐plane magnetic easy axis. The findings underscore a strong correlation between the LSSE signal and the orientation of magnetic easy axis in compensated ferrimagnets and opens the possibility to tune LSSE through effective anisotropy.

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H_{normalK}^{eff}

H_{normalK}^{OOP}

(

H_{normalK}^{IP}

). Figure 3d–f exhibits the temperature evolution of the IP and OOP anisotropy fields, that is,

H_{normalK}^{IP} (T)

and

H_{normalK}^{OOP} (T)

, respectively in the temperature range 100 K ≤ T ≤ 300 K. It is evident that

H_{normalK}^{IP}

H_{normalK}^{OOP}

for all the GdIG(t)/GGG films above and below T Comp , whereas, for the GdIG(31 nm)/GSGG film,

H_{normalK}^{IP}

H_{normalK}^{OOP}

for T ≥ T Comp but,

H_{normalK}^{IP}

H_{normalK}^{OOP}

for T < 200 K .…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Magnetization and Effective Magnetic Anisotropymentioning

confidence: 95%

“…In other words, for the OOP (IP) configuration, the TS scans probe the dynamics of the IP (OOP) spins. [33] Hence, we identify the effective anisotropy fields for the IP (OOP) configurations as…”

Section: Magnetization and Effective Magnetic Anisotropymentioning

confidence: 99%

See 2 more Smart Citations

Scaling of the Thermally Induced Sign Inversion of Longitudinal Spin Seebeck Effect in a Compensated Ferrimagnet: Role of Magnetic Anisotropy

Chanda

Holzmann

Schulz

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…While previous studies focused on the transport and spin properties of MnP single crystals [13][14][15][16][17][18], device applications would be realized mostly on thin films [19]. We have recently reported a comprehensive magnetic study on highly crystalline MnP nanorod films in which the magnetic phase diagrams have been constructed demonstrating the co-existing magnetic phases for the in-plane and out-of-plane field orientations [20]. These findings have motivated us to investigate the charge and spin transport properties of the MnP nanorod film over a wide temperature range (2 K < T < 350 K) in magnetic fields up to 8 T. In agreement with the previously reported transport results on MnP single crystals [13,17,19,21], a metallic conducting nature is also observed for the MnP nanorod film.…”

Section: Introductionmentioning

confidence: 99%

Intergranular Spin Dependent Tunneling Dominated Magnetoresistance in Helimagnetic Manganese Phosphide Thin Films

et al. 2023

Self Cite

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Helical magnets are emerging as a novel class of materials for spintronics and sensor applications; however, research on their charge- and spin-transport properties in a thin film form is less explored. Herein, we report the temperature and magnetic field-dependent charge transport properties of a highly crystalline MnP nanorod thin film over a wide temperature range (2 K < T < 350 K). The MnP nanorod films of ~100 nm thickness were grown on Si substrates at 500 °C using molecular beam epitaxy. The temperature-dependent resistivity ρ(T) data exhibit a metallic behavior (dρ/dT > 0) over the entire measured temperature range. However, large negative magnetoresistance (Δρ/ρ) of up to 12% is observed below ~50 K at which the system enters a stable helical (screw) magnetic state. In this temperature regime, the Δρ(H)/ρ(0) dependence also shows a magnetic field-manipulated CONE + FAN phase coexistence. The observed magnetoresistance is dominantly governed by the intergranular spin dependent tunneling mechanism. These findings pinpoint a correlation between the transport and magnetism in this helimagnetic system.

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MnP Films with Desired Magnetic, Magnetocaloric, and Thermoelectric Properties for a Perspective Magneto‐Thermo‐Electric Cooling Device

Hung

Madhogaria

Muchharla

et al. 2021

Physica Status Solidi (a)

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A new magneto‐thermo‐electric cooling device (MTECD) comprising a central magnetocaloric (MC) material (e.g., Gd) sandwiched by two thermoelectric (TE) materials (e.g., MnP) is proposed. The presence of the TE materials in the MTECD guides the heat flow direction and enhances heat pulsation. In this case, the usage of a ferromagnetic TE material that combines large TE with small MC properties within a similar temperature region can enhance the magnetic flux density and heat exchange efficiency. Herein, it is shown that MnP nanorod‐structured films with desired magnetic, MC, and TE properties are very promising for use in MTECDs. The films are grown on Si substrates at 300, 400, and 500 °C using molecular beam epitaxy. The 400 °C sample shows a desired TE and MC combination. A large power factor of 24.06 μW m−1 K−2 is achieved at room temperature. In this temperature region, the film exhibits a small MC effect (−ΔSM ≈0.64 J kg−1 K and ΔTad ≈0.3 K at μ0H = 2 T) but ferromagnetism that gives rise to the enhanced MC effect of the central MC material. These properties can enable the MTECD to operate at high frequency.

show abstract

Strain-modulated helimagnetism and emergent magnetic phase diagrams in highly crystalline MnP nanorod films

Cited by 6 publications

References 39 publications

Scaling of the Thermally Induced Sign Inversion of Longitudinal Spin Seebeck Effect in a Compensated Ferrimagnet: Role of Magnetic Anisotropy

Scaling of the Thermally Induced Sign Inversion of Longitudinal Spin Seebeck Effect in a Compensated Ferrimagnet: Role of Magnetic Anisotropy

Intergranular Spin Dependent Tunneling Dominated Magnetoresistance in Helimagnetic Manganese Phosphide Thin Films

MnP Films with Desired Magnetic, Magnetocaloric, and Thermoelectric Properties for a Perspective Magneto‐Thermo‐Electric Cooling Device

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