One challenge is the lack of experimental evidence

The gap

Evidence profile

Sourced from the future-work section and stated challenges and future work of the source papers, classified as general, drawn from work published between 2024 and 2026, spanning 3 journals. Those papers have been cited 823 times in total.

Supporting evidence — 4 representative gaps

• Observation of time-reversal symmetry breaking in the band structure of altermagnetic RuO 2 (2024) · Science Advances · cited 341× · doi

  Future research could explore the potential of altermagnets for spintronic applications. Studies could investigate the properties of altermagnets in different materials and systems. Theoretical models could be developed to further understand the unconventional time-reversal symmetry breaking in altermagnets.

  generalfuture-work section
  Keywords: future research explore potential altermagnets spintronic applications studies
• Observation of time-reversal symmetry breaking in the band structure of altermagnetic RuO 2 (2024) · Science Advances · cited 341× · doi

  One challenge is the lack of experimental evidence for the altermagnetic phase. Another challenge is the need to develop new theoretical models to understand the unconventional time-reversal symmetry breaking in altermagnets.

  generalstated challenges
  Keywords: one challenge lack experimental evidence altermagnetic phase another
• Altermagnetism with non-collinear spins (2024) · npj Quantum Materials · cited 141× · doi

  Altermagnetism with non-collinear spins Sang-Wook Cheong 1 ✉ and Fei-Ting Huang 1 Altermagnetism is introduced as a category of magnetic states with ‘collinear’ antiferromagnetic spins and alternating variations of local structures around spins in such a way that the symmetry allows typical ferromagnetic behaviors. Altermagnets exhibiting ferromagnetic behaviors without any external perturbations (type-I) turn out to belong to the ferromagnetic point group. Other altermagnets (type-II and type-III) can have ferromagnetic behaviors only with external perturbations such as electric current or stress, which conserve parity-time-reversal (PT) symmetry. All types of altermagnets themselves have broken PT symmetry. The concept of altermagnetism can be extended to accommodate non-collinear spins and multiple local-structure variations. npj Quantum Materials (2024) 9:13; https://doi.org/10.1038/s41535-024-00626-6;,:) ( 0 9 8 7 6 5 4 3 2 1 INTRODUCTION Spintronics1–4 where spin and charge degrees of freedom are mutually coupled and manipulated through crossing conjugate fields (i.e., electric fields for spins and magnetic fields for charges) has been an active research area for the last three decades since the discovery of giant magnetoresistance5–8, and has been well implemented in real devices. Traditionally, spintronics utilizes ferro-(ferri)magnets since the manipulation and detection of these ferro-(ferri)magnetic states are straightforward. But antiferromagnetic spintronics1,3,9–11 has become highly topical due to the the antiferromagnetic state and its active manipulation of magnetic textures via spin and charge currents. Antiferromagnetic materials, in general, could embody the numerous interesting features beneficial for spintronic applications12–14: they produce no stray fields, so are robust against external magnetic fields and make them suitable for device miniaturization, display ultrafast dynamics in THz ranges, and are capable of generating good spincurrent transport with micrometer spin-diffusion lengths. Altermagnets15–20 are magnets with collinear antiferro- ‘alter’nating spins), and also arrangement of one-kind spins (i.e., simultaneously with ‘alter’nating orientations of local structures around spins, maintaining a symmetry that enables ferromagnetic behaviors (non-zero net magnetic moment, Anomalous Hall effect (AHE), etc.)18,21. In other words, in altermagnets, spin magnetic moments are fully compensated when spin-orbital coupling (SOC) is zero, but non-zero SOC, enabling coupling between spins and alternating local structures (such as oxygen coordination around magnetic ions), can result in a non-zero net magnetic moment and other ferromagnetic behaviors through uncompensated ‘orbital magnetic moments’. FERROMAGNETISM VS. ANTIFERROMAGNETISM Surprisingly, antiferromagnetism is not formally defined even though the term has been used frequently, but the ferromagnetic point group is well-defined in terms of symmetry.

  generalfuture workevidence 5/5
  Keywords: magnetic spins ferromagnetic spin symmetry behaviors altermagnets elds collinear local zero altermagnetism antiferromagnetic structures around
• Effect of symmetry breaking on altermagnetism in CrSb and formation of fragmented nodal curves (2026) · Physical Review B · doi

  Future research should focus on experimental verification of the findings. The study of altermagnetism in other compounds with lower symmetry could lead to the discovery of new materials with unique properties. The development of new materials with tailored properties could lead to potential applications in spintronics.

  generalfuture-work sectionevidence 5/5
  Keywords: future research focus experimental verification findings study altermagnetism

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