New perspective on symmetry breaking in a clean antiferromagnetic chain: Spin-selective transport and NDR phenomenon
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arXiv
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| Natura: | Preprint |
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2025
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| _version_ | 1866914586226065408 |
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| author | Patra, Prabhab Maiti, Santanu K. |
| author_facet | Patra, Prabhab Maiti, Santanu K. |
| contents | The primary requirement for achieving spin-selective electron transfer in a nanojunction possessing a magnetic system with zero net magnetization is to break the symmetry between the up and down spin sub-Hamiltonians. Circumventing the available approaches, in the present work, we put forward a new mechanism for symmetry breaking by introducing a bias drop along the functional element. To demonstrate this, we consider a clean magnetic chain with antiparallel alignment of neighboring magnetic moments. The junction is modeled within a tight-binding framework, and spin-dependent transmission probabilities are evaluated using wave-guide theory. The corresponding current components are obtained through the Landauer-Büttiker formalism. Selective spin currents, exhibiting a high degree of spin polarization, are obtained over a wide bias region. Moreover, the bias-dependent transmission profile exhibits negative differential resistance (NDR), another important aspect of our study. We examine the results under three different potential profiles, one linear and two non-linear, and in each case, we observe a favorable response. This work may offer a new route for designing efficient spintronic devices based on bias-controlled magnetic systems with vanishing net magnetization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_16874 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | New perspective on symmetry breaking in a clean antiferromagnetic chain: Spin-selective transport and NDR phenomenon Patra, Prabhab Maiti, Santanu K. Mesoscale and Nanoscale Physics The primary requirement for achieving spin-selective electron transfer in a nanojunction possessing a magnetic system with zero net magnetization is to break the symmetry between the up and down spin sub-Hamiltonians. Circumventing the available approaches, in the present work, we put forward a new mechanism for symmetry breaking by introducing a bias drop along the functional element. To demonstrate this, we consider a clean magnetic chain with antiparallel alignment of neighboring magnetic moments. The junction is modeled within a tight-binding framework, and spin-dependent transmission probabilities are evaluated using wave-guide theory. The corresponding current components are obtained through the Landauer-Büttiker formalism. Selective spin currents, exhibiting a high degree of spin polarization, are obtained over a wide bias region. Moreover, the bias-dependent transmission profile exhibits negative differential resistance (NDR), another important aspect of our study. We examine the results under three different potential profiles, one linear and two non-linear, and in each case, we observe a favorable response. This work may offer a new route for designing efficient spintronic devices based on bias-controlled magnetic systems with vanishing net magnetization. |
| title | New perspective on symmetry breaking in a clean antiferromagnetic chain: Spin-selective transport and NDR phenomenon |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2510.16874 |