Rare-earth-free noncollinear metallic ferrimagnets Mn4-xZxN with compensation at room temperature

Boosted Polysulfide Conversion by Co, Mn Bimetallic-Modulated Nitrogen–Carbon Material for Advanced Lithium–Sulfur Batteries

“…Carbon tubes can not only provide ion transport pathways but also limit the dispersal of polysulfide. High-resolution TEM (HRTEM) images (Figure d–g) show crystal plane spacings of 0.197, 0.219, and 0.34 nm, which are exactly consistent with Co(111), Mn 4 N (111), and C(002). − The above results are further supported by the corresponding interlayer spacing of Co, C, and Mn 4 N (Figure h–j). The TEM (Figure S1d,e) and Fourier transform diagram (Figure S1f) of N–C show the amorphous property.…”

Noncollinear ferrimagnetism and anomalous Hall effects in Mn4N thin films

“…A later neutron study with polarization analysis revealed frustrated noncollinear ferrimagnetism that combines a 120°triangular antiferromagnetism of the projection of Mn 3c-site moments onto the (111) plane and a ferrimagnetic ordering of the collinear 1a sublattice and the ferromagnetic component of the 3c moments along the [111]-easy direction [19]. The triangular in-plane antiferromagnetism, confirmed by subsequent density functional theory (DFT) calculations [11,20] is a result of the frustration of the antiferromagnetic coupling arising from the short distance (∼0.270 nm) between the nearestneighbor Mn 3c atoms in the (111)-kagome planes [11].…”

“…Figure 1(h) shows the opposite variation of magnetization and coercivity with temperature. The unusually rapid decline of the magnetization from 4 to 100 K without compensation at higher temperature is a sign of a noncollinear structure [11,18]. T C is estimated to be 750 ± 20 K by comparison with the temperature dependence of the magnetization of bulk material [11].…”

“…The noncollinear manganese nitride Mn 4 N and related ternary alloys Mn 4−x Z x N (Z is a nonmagnetic dopant) with the perovskite structure are attractive because of the opportunities they offer [6] for combining compensated ferrimagnetism [10,11] with good electrical and thermal transport properties [12], strain sensitivity [13], first-order phase transitions [14], magnetic skyrmions [15], and magneto-optic spintronics [16]. Bulk Mn 4 N crystallizes in space-group Pm 3m where N is in octahedral coordination at the body-centered interstitial site of a Mn face-centered-cubic lattice.…”

“…A slight tetragonal distortion breaks the cubic symmetry of the bulk, splitting the 3c sites into inequivalent 2e and 1c sites in space-group P4/mmm. Up to now, most studies of Mn 4 N thin films have ignored the frustration of the antiferromagnetic interactions [11,24] and treated them as simple collinear ferrimagnets as shown in Fig. 2(a).…”