Park, Byung Cheol Lee, Howon Oh, Sang Hyup Shin, Hyun Jun Choi, Young Jai Ha, Taewoo 2024-05-23T05:00:17Z 2024-05-23T05:00:17Z 2024-05-23 2024-04 https://pubs.kist.re.kr/handle/201004/149884 Phase diagrams of materials are typically based on a static order parameter, but it faces challenges when distinguishing subtle phase changes, such as re-ordering. Here, we report a dynamic nonequilibrium order parameter termed re-order parameter to determine subtle phases and their transitions in interacting magnets. The dynamical precession of magnetization, so-called magnon, premises as a reliable re-order parameter of strong spin-orbit coupled magnets. We employ orthoferrites YFeO3 and its Mn-doped variations, where diverse magnetic phases, including canted antiferromagnetic (Gamma 4) and collinear antiferromagnetic (Gamma 1) states, have been well-established. Low-energy magnon uncovers the spin-orbit coupling-induced subtle magnetic structures, resulting in distinct terahertz emissions. The temporal and spectral parameters of magnon emission exhibit characteristics akin to BCS-type order parameters, constructing the magnetic phase diagram of Mn-doped YFeO3. This approach further reveals a concealed ferrimagnetic phase within the Gamma 1 state, underscoring its potential to search for hidden phases of materials, completing their phase diagrams. Phase diagrams of materials are typically based on a static order parameter, but it faces challenges when distinguishing subtle phase changes, such as re-ordering. Here the authors introduce a dynamic re-order parameter, in particular magnons, and illustrate it in a material with complex magnetic phases. English Nature Publishing Group Re-order parameter of interacting thermodynamic magnets Article 10.1038/s41467-024-47637-2 1 Nature Communications, v.15, no.1 Nature Communications 15 1 Y scie scopus 001205232100023 2-s2.0-85190672066 Multidisciplinary Sciences Science & Technology - Other Topics Article INDUCED SPIN REORIENTATION