Hard ferrimagnetism in the layered magnet L i4 M n2 T e2 O11

We report on the characterization of Li4Mn2Te2O11, a previously unstudied layered oxide that exhibits ferrimagnetic ordering below 30 K and an exceptionally large coercive field exceeding 9 T at 2 K. The crystal structure consists of alternating Mn3+ triangular layers and zigzag chains, creating two inequivalent magnetic sublattices. Magnetic measurements reveal net in-plane magnetization and pronounced anisotropy, with strong hysteresis and domain pinning behaviors. The magnetization direction is controlled by the field-cooling history and remains locked under applied fields up to 9 T. Out-of-plane measurements show negligible net magnetization but exhibit a distinct high-field kink, likely attributed to spin reorientation. Heat capacity data show a broad magnetic anomaly that shifts and weakens under field, consistent with antiferromagnetic-dominated interactions. These results establish Li4Mn2Te2O11 as a rare ultrahard ferrimagnet with strong anisotropy, offering a promising platform for low-dimensional spintronic and domain engineering applications.