{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:X2ZZV5DFJ5QMOMWJ2BGIH4PUFN","short_pith_number":"pith:X2ZZV5DF","canonical_record":{"source":{"id":"2504.20014","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2025-04-28T17:33:46Z","cross_cats_sorted":[],"title_canon_sha256":"689cc9bcc6289e579e2b95fe8ffc0dbf49fba1b498747d3242d63bef0ffe8afa","abstract_canon_sha256":"75103e2981315664adb2ccbd2e188e85b558f7f1b0e3505b9ae508338c7252f1"},"schema_version":"1.0"},"canonical_sha256":"beb39af4654f60c732c9d04c83f1f42b5aa35614cb0259796292aa75895ff9f8","source":{"kind":"arxiv","id":"2504.20014","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.20014","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"arxiv_version","alias_value":"2504.20014v3","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.20014","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"pith_short_12","alias_value":"X2ZZV5DFJ5QM","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"pith_short_16","alias_value":"X2ZZV5DFJ5QMOMWJ","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"pith_short_8","alias_value":"X2ZZV5DF","created_at":"2026-07-05T10:56:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:X2ZZV5DFJ5QMOMWJ2BGIH4PUFN","target":"record","payload":{"canonical_record":{"source":{"id":"2504.20014","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2025-04-28T17:33:46Z","cross_cats_sorted":[],"title_canon_sha256":"689cc9bcc6289e579e2b95fe8ffc0dbf49fba1b498747d3242d63bef0ffe8afa","abstract_canon_sha256":"75103e2981315664adb2ccbd2e188e85b558f7f1b0e3505b9ae508338c7252f1"},"schema_version":"1.0"},"canonical_sha256":"beb39af4654f60c732c9d04c83f1f42b5aa35614cb0259796292aa75895ff9f8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:56:39.785306Z","signature_b64":"O7MtBCbb4f1w4j2gzfXTniNHT70QnmWWfApwdxkHHT5jLeYi+7KPXKgwVCl2iJsieef+zYz1m5tsP2+bdmb/CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"beb39af4654f60c732c9d04c83f1f42b5aa35614cb0259796292aa75895ff9f8","last_reissued_at":"2026-07-05T10:56:39.784850Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:56:39.784850Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2504.20014","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:56:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4GLC+U2xvqMtm6Y7B1KVSEa4DvK8jRp1nQhCyd5X5Vi8ymCVIplkAqxtJ4v0IHS72zW3fI2smpOd5ZC40y2VBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T22:06:47.737237Z"},"content_sha256":"a9a17d917d923371177068addb9406ff82d32459cd4bfd6d500b3f861d44d13b","schema_version":"1.0","event_id":"sha256:a9a17d917d923371177068addb9406ff82d32459cd4bfd6d500b3f861d44d13b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:X2ZZV5DFJ5QMOMWJ2BGIH4PUFN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Thin-film scandium aluminum nitride bulk acoustic resonator with high Q of 208 and K2 of 9.5% at 12.5 GHz","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.app-ph","authors_text":"Eugene Kwon, Ian Anderson, Jack Kramer, Lezli Matto, Mark Goorksy, Michael Liao, Omar Barrera, Ruochen Lu, Sinwoo Cho, Tzu-Hsuan Hsu, Vakhtang Chulukhadze, Yinan Wang","submitted_at":"2025-04-28T17:33:46Z","abstract_excerpt":"This work describes sputtered scandium aluminum nitride (ScAlN) thin-film bulk acoustic resonators (FBAR) at 12.5 GHz with high electromechanical coupling (k2) of 9.5% and quality factor (Q) of 208, resulting in a figure of merit (FoM, Qk2) of 19.8. ScAlN resonators employ a stack of 90 nm thick 20% Sc doping ScAlN piezoelectric film on the floating bottom 38 nm thick platinum (Pt) electrode to achieve low losses and high coupling toward centimeter wave (cmWave) frequency band operation. Three fabricated and FBARs are reported, show promising prospects of ScAlN-Pt stack towards cmWave front-en"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.20014","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2504.20014/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T10:56:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TavwBb7VMedJc9wRd0/FX7w1mCbPV23NmwzfHsSOhr2OJNrhfIWkyDDqmMqK/U2VwTDh16BlNphTbFSNF6B4Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T22:06:47.737630Z"},"content_sha256":"c3f4fd66bb5ec76c4e9aaffe37bbc4a0f689d05739783c3754e6d8b11dd0f6dd","schema_version":"1.0","event_id":"sha256:c3f4fd66bb5ec76c4e9aaffe37bbc4a0f689d05739783c3754e6d8b11dd0f6dd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/X2ZZV5DFJ5QMOMWJ2BGIH4PUFN/bundle.json","state_url":"https://pith.science/pith/X2ZZV5DFJ5QMOMWJ2BGIH4PUFN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/X2ZZV5DFJ5QMOMWJ2BGIH4PUFN/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":"2026-08-05T22:06:47Z","links":{"resolver":"https://pith.science/pith/X2ZZV5DFJ5QMOMWJ2BGIH4PUFN","bundle":"https://pith.science/pith/X2ZZV5DFJ5QMOMWJ2BGIH4PUFN/bundle.json","state":"https://pith.science/pith/X2ZZV5DFJ5QMOMWJ2BGIH4PUFN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/X2ZZV5DFJ5QMOMWJ2BGIH4PUFN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:X2ZZV5DFJ5QMOMWJ2BGIH4PUFN","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":"75103e2981315664adb2ccbd2e188e85b558f7f1b0e3505b9ae508338c7252f1","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2025-04-28T17:33:46Z","title_canon_sha256":"689cc9bcc6289e579e2b95fe8ffc0dbf49fba1b498747d3242d63bef0ffe8afa"},"schema_version":"1.0","source":{"id":"2504.20014","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.20014","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"arxiv_version","alias_value":"2504.20014v3","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.20014","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"pith_short_12","alias_value":"X2ZZV5DFJ5QM","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"pith_short_16","alias_value":"X2ZZV5DFJ5QMOMWJ","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"pith_short_8","alias_value":"X2ZZV5DF","created_at":"2026-07-05T10:56:39Z"}],"graph_snapshots":[{"event_id":"sha256:c3f4fd66bb5ec76c4e9aaffe37bbc4a0f689d05739783c3754e6d8b11dd0f6dd","target":"graph","created_at":"2026-07-05T10:56:39Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2504.20014/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This work describes sputtered scandium aluminum nitride (ScAlN) thin-film bulk acoustic resonators (FBAR) at 12.5 GHz with high electromechanical coupling (k2) of 9.5% and quality factor (Q) of 208, resulting in a figure of merit (FoM, Qk2) of 19.8. ScAlN resonators employ a stack of 90 nm thick 20% Sc doping ScAlN piezoelectric film on the floating bottom 38 nm thick platinum (Pt) electrode to achieve low losses and high coupling toward centimeter wave (cmWave) frequency band operation. Three fabricated and FBARs are reported, show promising prospects of ScAlN-Pt stack towards cmWave front-en","authors_text":"Eugene Kwon, Ian Anderson, Jack Kramer, Lezli Matto, Mark Goorksy, Michael Liao, Omar Barrera, Ruochen Lu, Sinwoo Cho, Tzu-Hsuan Hsu, Vakhtang Chulukhadze, Yinan Wang","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2025-04-28T17:33:46Z","title":"Thin-film scandium aluminum nitride bulk acoustic resonator with high Q of 208 and K2 of 9.5% at 12.5 GHz"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.20014","kind":"arxiv","version":3},"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:a9a17d917d923371177068addb9406ff82d32459cd4bfd6d500b3f861d44d13b","target":"record","created_at":"2026-07-05T10:56:39Z","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":"75103e2981315664adb2ccbd2e188e85b558f7f1b0e3505b9ae508338c7252f1","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2025-04-28T17:33:46Z","title_canon_sha256":"689cc9bcc6289e579e2b95fe8ffc0dbf49fba1b498747d3242d63bef0ffe8afa"},"schema_version":"1.0","source":{"id":"2504.20014","kind":"arxiv","version":3}},"canonical_sha256":"beb39af4654f60c732c9d04c83f1f42b5aa35614cb0259796292aa75895ff9f8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"beb39af4654f60c732c9d04c83f1f42b5aa35614cb0259796292aa75895ff9f8","first_computed_at":"2026-07-05T10:56:39.784850Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:56:39.784850Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"O7MtBCbb4f1w4j2gzfXTniNHT70QnmWWfApwdxkHHT5jLeYi+7KPXKgwVCl2iJsieef+zYz1m5tsP2+bdmb/CQ==","signature_status":"signed_v1","signed_at":"2026-07-05T10:56:39.785306Z","signed_message":"canonical_sha256_bytes"},"source_id":"2504.20014","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a9a17d917d923371177068addb9406ff82d32459cd4bfd6d500b3f861d44d13b","sha256:c3f4fd66bb5ec76c4e9aaffe37bbc4a0f689d05739783c3754e6d8b11dd0f6dd"],"state_sha256":"034c378b87b586717e18ca0e3e20104074203381bc75f731e513aa25f36f0895"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jWHWFvDZ5g7oL7rGhimQsbzGkyesBlyhqqZuqU9N6Ce8bFxMkU/mJpqKaEOp18/yQxzSvNgx7TLdMtJruCRbAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T22:06:47.740159Z","bundle_sha256":"e7b80f04f90730c40a8d80f3ff8cdc556f22c031c4154efa192e53cff4946a4b"}}