{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:VZ7N2JTQ26BDRMMR2N3C6LEOA7","short_pith_number":"pith:VZ7N2JTQ","canonical_record":{"source":{"id":"1304.2205","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-08T13:38:05Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"af4be3f270c030de6cbd7a6e959492e1dea2f49b1f0852b5965eae0278275a6a","abstract_canon_sha256":"d85f782caaa9f87cdcec217a6ad99a7a57e6f9ebf1ee353f07eaed8d41a27a38"},"schema_version":"1.0"},"canonical_sha256":"ae7edd2670d78238b191d3762f2c8e07eba2aa57a111c86b8efc0ef59e809a4b","source":{"kind":"arxiv","id":"1304.2205","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.2205","created_at":"2026-05-18T03:28:43Z"},{"alias_kind":"arxiv_version","alias_value":"1304.2205v1","created_at":"2026-05-18T03:28:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.2205","created_at":"2026-05-18T03:28:43Z"},{"alias_kind":"pith_short_12","alias_value":"VZ7N2JTQ26BD","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_16","alias_value":"VZ7N2JTQ26BDRMMR","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_8","alias_value":"VZ7N2JTQ","created_at":"2026-05-18T12:28:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:VZ7N2JTQ26BDRMMR2N3C6LEOA7","target":"record","payload":{"canonical_record":{"source":{"id":"1304.2205","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-08T13:38:05Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"af4be3f270c030de6cbd7a6e959492e1dea2f49b1f0852b5965eae0278275a6a","abstract_canon_sha256":"d85f782caaa9f87cdcec217a6ad99a7a57e6f9ebf1ee353f07eaed8d41a27a38"},"schema_version":"1.0"},"canonical_sha256":"ae7edd2670d78238b191d3762f2c8e07eba2aa57a111c86b8efc0ef59e809a4b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:28:43.706531Z","signature_b64":"fdtJPpseOsEQEGbRuPoy+zd8gcf9HiW28JFsYjCBLZnq63UiTgXEo9yiVRBBvUTX6QvOvNvCk13j9YzB3soOAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ae7edd2670d78238b191d3762f2c8e07eba2aa57a111c86b8efc0ef59e809a4b","last_reissued_at":"2026-05-18T03:28:43.705776Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:28:43.705776Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1304.2205","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:28:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"I04WeoDLYDGLKK1KZmmcBuz7yDbKIxbWHFLHw5ekkrh/2sHPojT3TGXHWiC0ETA82MeJPUEO5WmuWLKyzxTmDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T08:51:37.734679Z"},"content_sha256":"f3a92f4e552a2fe4ee28790152b7a4e477b10bc095897699bf91bd7981af88b5","schema_version":"1.0","event_id":"sha256:f3a92f4e552a2fe4ee28790152b7a4e477b10bc095897699bf91bd7981af88b5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:VZ7N2JTQ26BDRMMR2N3C6LEOA7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spontaneous exchange bias in a nanocomposite of BiFeO$_3$-Bi$_2$Fe$_4$O$_9$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Dipten Bhattacharya, Gopes C. Das, Saibal Roy, Sudipta Goswami, Tuhin Maity","submitted_at":"2013-04-08T13:38:05Z","abstract_excerpt":"We have observed a large as well as path-dependent spontaneous exchange bias (H$_{SEB}$) ($\\sim$30-60 mT) in a nanocomposite of BiFeO$_3$-Bi$_2$Fe$_4$O$_9$ across 5-300 K when it is measured in an unmagnetized state following zero-field cooling and appropriate demagnetization. The path dependency yields a variation in the exchange bias depending on the sign of the starting field and the path followed in tracing the hysteresis loop. The asymmetry thus observed - $\\Delta$H$_{SEB}$ - is found to be decreasing nonmonotonically across 5-300 K with a peak around 200 K. The $\\Delta$H$_{SEB}$ together"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.2205","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:28:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FIwzEjzsq5wNWxOw/Nvdu7yf3J7ekmy2vCWCAb7vUbOvKPb0OshvcXCS2Yj2EXY0Yu+RdoBti491yxuX2kKxDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T08:51:37.735385Z"},"content_sha256":"617508acada6cdf9a559a86d53b3d0d249257eb9379d9786d83de7a418d39df6","schema_version":"1.0","event_id":"sha256:617508acada6cdf9a559a86d53b3d0d249257eb9379d9786d83de7a418d39df6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VZ7N2JTQ26BDRMMR2N3C6LEOA7/bundle.json","state_url":"https://pith.science/pith/VZ7N2JTQ26BDRMMR2N3C6LEOA7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VZ7N2JTQ26BDRMMR2N3C6LEOA7/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-27T08:51:37Z","links":{"resolver":"https://pith.science/pith/VZ7N2JTQ26BDRMMR2N3C6LEOA7","bundle":"https://pith.science/pith/VZ7N2JTQ26BDRMMR2N3C6LEOA7/bundle.json","state":"https://pith.science/pith/VZ7N2JTQ26BDRMMR2N3C6LEOA7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VZ7N2JTQ26BDRMMR2N3C6LEOA7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:VZ7N2JTQ26BDRMMR2N3C6LEOA7","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"d85f782caaa9f87cdcec217a6ad99a7a57e6f9ebf1ee353f07eaed8d41a27a38","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-08T13:38:05Z","title_canon_sha256":"af4be3f270c030de6cbd7a6e959492e1dea2f49b1f0852b5965eae0278275a6a"},"schema_version":"1.0","source":{"id":"1304.2205","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.2205","created_at":"2026-05-18T03:28:43Z"},{"alias_kind":"arxiv_version","alias_value":"1304.2205v1","created_at":"2026-05-18T03:28:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.2205","created_at":"2026-05-18T03:28:43Z"},{"alias_kind":"pith_short_12","alias_value":"VZ7N2JTQ26BD","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_16","alias_value":"VZ7N2JTQ26BDRMMR","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_8","alias_value":"VZ7N2JTQ","created_at":"2026-05-18T12:28:04Z"}],"graph_snapshots":[{"event_id":"sha256:617508acada6cdf9a559a86d53b3d0d249257eb9379d9786d83de7a418d39df6","target":"graph","created_at":"2026-05-18T03:28:43Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We have observed a large as well as path-dependent spontaneous exchange bias (H$_{SEB}$) ($\\sim$30-60 mT) in a nanocomposite of BiFeO$_3$-Bi$_2$Fe$_4$O$_9$ across 5-300 K when it is measured in an unmagnetized state following zero-field cooling and appropriate demagnetization. The path dependency yields a variation in the exchange bias depending on the sign of the starting field and the path followed in tracing the hysteresis loop. The asymmetry thus observed - $\\Delta$H$_{SEB}$ - is found to be decreasing nonmonotonically across 5-300 K with a peak around 200 K. The $\\Delta$H$_{SEB}$ together","authors_text":"Dipten Bhattacharya, Gopes C. Das, Saibal Roy, Sudipta Goswami, Tuhin Maity","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-08T13:38:05Z","title":"Spontaneous exchange bias in a nanocomposite of BiFeO$_3$-Bi$_2$Fe$_4$O$_9$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.2205","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:f3a92f4e552a2fe4ee28790152b7a4e477b10bc095897699bf91bd7981af88b5","target":"record","created_at":"2026-05-18T03:28:43Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"d85f782caaa9f87cdcec217a6ad99a7a57e6f9ebf1ee353f07eaed8d41a27a38","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-08T13:38:05Z","title_canon_sha256":"af4be3f270c030de6cbd7a6e959492e1dea2f49b1f0852b5965eae0278275a6a"},"schema_version":"1.0","source":{"id":"1304.2205","kind":"arxiv","version":1}},"canonical_sha256":"ae7edd2670d78238b191d3762f2c8e07eba2aa57a111c86b8efc0ef59e809a4b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ae7edd2670d78238b191d3762f2c8e07eba2aa57a111c86b8efc0ef59e809a4b","first_computed_at":"2026-05-18T03:28:43.705776Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:28:43.705776Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fdtJPpseOsEQEGbRuPoy+zd8gcf9HiW28JFsYjCBLZnq63UiTgXEo9yiVRBBvUTX6QvOvNvCk13j9YzB3soOAg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:28:43.706531Z","signed_message":"canonical_sha256_bytes"},"source_id":"1304.2205","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f3a92f4e552a2fe4ee28790152b7a4e477b10bc095897699bf91bd7981af88b5","sha256:617508acada6cdf9a559a86d53b3d0d249257eb9379d9786d83de7a418d39df6"],"state_sha256":"1ed72f84b5949668fe89b90edf5ec7a93c73897d240289f79687595954813c29"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OqiagyAMZhWrpMzWrBwj/nxMvoqXRYV4s2PM3bbZ3sVqSTcHk14djm+hXGyej61LiMfBPuPytF/mMw0s/8uMCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T08:51:37.738370Z","bundle_sha256":"0bf47922f642deca3a890a9f70a6c27589b5d35ca0970188a0df8c740d35c62f"}}